First Trimester Checklist: Everything to Do Before Next Trimester
Complete first trimester checklist. Medical appointments, baby prep, self-care, and practical tasks organized week by week.
✅ Step 1: Confirm Your Pregnancy
Home pregnancy tests are highly accurate when taken after a missed period — about 99% when used correctly. If you get a positive result, the next step is to call your OB-GYN or midwife to schedule your first prenatal appointment. Some providers will order a blood test (quantitative hCG) to confirm the pregnancy and check that hormone levels are rising appropriately, especially if you have a history of miscarriage or ectopic pregnancy.
- Take a home urine test on or after the day of your missed period for the most reliable result
- A faint line is still a positive — hCG levels double roughly every 48-72 hours in early pregnancy
- Your doctor may order two blood draws 48 hours apart to confirm hCG is doubling normally
- False positives are extremely rare; false negatives happen if you test too early
📞 Step 2: Schedule Your First Prenatal Appointment
Most OB-GYN practices schedule the first appointment between 8 and 10 weeks of pregnancy, counted from the first day of your last menstrual period. This timing allows the dating ultrasound to be most accurate and gives your provider enough development to see on the screen. If you are not yet established with an OB, start calling practices now — popular providers can have wait lists of several weeks.
- Call within a few days of your positive test to get on the schedule
- If you take medications for chronic conditions (thyroid, depression, epilepsy), ask for an earlier appointment to discuss adjustments
- Call sooner if you experience sharp one-sided pelvic pain, heavy bleeding, or dizziness, as these can be signs of ectopic pregnancy
- If you do not have an OB, ask your primary care doctor for a referral or check your insurance directory
💊 Step 3: Start Prenatal Vitamins
If you are not already taking a prenatal vitamin, start immediately. The most critical nutrient is folic acid — you need at least 400 mcg daily (the CDC recommends 400-800 mcg). Folic acid prevents neural tube defects such as spina bifida and anencephaly, and the neural tube closes by about week 6 of pregnancy. Many prenatal vitamins also contain DHA (an omega-3 fatty acid important for brain development), iron (to prevent anemia), and calcium.
- Look for at least 400 mcg folic acid (or methylfolate if you have an MTHFR variant)
- If your prenatal makes you nauseated, try taking it at night with a snack, or switch to a gummy version
- Iron in prenatals can cause constipation — increase water and fiber intake to counteract this
- Avoid supplements with more than 10,000 IU of vitamin A (retinol form), which can cause birth defects
🚫 Step 4: Know What to Avoid
Certain foods, substances, and exposures can harm a developing baby, especially during the first trimester when organs are forming. Some of these are well-known, but others may surprise you.
- Alcohol: No amount is considered safe at any point in pregnancy. Alcohol crosses the placenta freely and can cause fetal alcohol spectrum disorders
- Smoking and vaping: Increases risk of miscarriage, preterm birth, low birth weight, and SIDS. Quitting at any point helps — talk to your doctor about cessation support
- Raw fish and high-mercury fish: Skip sushi with raw fish, and limit tuna. Avoid swordfish, shark, king mackerel, and tilefish entirely
- Deli meats and hot dogs: Risk of listeria contamination, which can cause miscarriage. Heat deli meat to steaming (165°F) before eating
- Soft cheeses: Unpasteurized brie, camembert, queso fresco, and feta can carry listeria. Pasteurized versions are fine
- Caffeine: Limit to 200 mg per day (about one 12 oz cup of coffee). High caffeine intake is linked to increased miscarriage risk
- Cat litter: Toxoplasmosis risk — have someone else change the litter box, or wear gloves and wash hands thoroughly
🩺 Step 5: First Ultrasound and Genetic Screening
Your dating ultrasound typically happens at 8-10 weeks. This confirms how far along you are, checks for a heartbeat (which is usually detectable by week 6-7), determines if there are multiples, and rules out ectopic pregnancy. Around weeks 10-13, you will be offered optional genetic screening.
- Dating ultrasound (8-10 weeks): Confirms gestational age, measures the embryo (crown-rump length), and checks for cardiac activity
- NIPT (Non-Invasive Prenatal Testing, 10+ weeks): A blood draw that screens for Down syndrome (trisomy 21), trisomy 18, trisomy 13, and sex chromosome differences. It can also reveal the baby's sex. Accuracy is over 99% for Down syndrome
- NT scan (Nuchal Translucency, 11-13 weeks): An ultrasound measuring fluid at the back of the baby's neck, combined with a blood test. Screens for chromosomal abnormalities
- These screenings are optional. A positive screen does not mean a diagnosis — it means further testing (CVS or amniocentesis) would be needed to confirm
📢 Step 6: Decide When to Share the News
The traditional 12-week mark for announcing pregnancy exists because the risk of miscarriage drops significantly after the first trimester. In the general population, miscarriage risk is about 10-20% before 12 weeks. After a heartbeat is confirmed on ultrasound (around 7-8 weeks), the risk drops to about 5%. After 12 weeks, it falls to roughly 1-2%.
- Some parents wait for NIPT or NT results (around 12-14 weeks) before announcing
- You may want to tell a few close people early for emotional support regardless of outcome
- If your job involves physical labor or exposure to chemicals, you may need to tell your employer earlier for safety accommodations
- There is no wrong answer — do what feels right for your family
⚖️ Step 7: Know Your Workplace Rights
In the United States, the Pregnancy Discrimination Act prohibits employers with 15 or more employees from discriminating based on pregnancy. The Pregnant Workers Fairness Act (2023) requires employers to provide reasonable accommodations such as extra bathroom breaks, a stool for standing jobs, or modified schedules for morning sickness appointments.
- You are not legally required to tell your employer at any specific time, though most people share the news between 12-20 weeks
- FMLA provides up to 12 weeks of unpaid, job-protected leave if you have worked at your company for 12 months and the employer has 50+ employees
- Start researching your company's parental leave policy now — ask HR for the written policy
- Check your state's paid family leave laws, as several states offer partial wage replacement
🤢 Managing Morning Sickness
About 70% of pregnant women experience nausea, and roughly 50% have vomiting. Despite the name, it can happen at any time of day. It typically starts around week 6, peaks at weeks 9-10, and improves for most women by weeks 14-16. Here is what actually helps:
- Eat before you feel hungry: An empty stomach makes nausea worse. Eat small amounts every 2-3 hours
- Protein and complex carbs: Toast with peanut butter, cheese and crackers, or yogurt tend to settle better than sugary or greasy foods
- Ginger: Real ginger ale (check the label — most commercial brands have no real ginger), ginger chews, or ginger tea
- Vitamin B6: 25 mg up to three times daily. Available over the counter
- Doxylamine + B6: Half a Unisom SleepTab (doxylamine) at night plus B6 is the same active combination in the prescription drug Diclegis
- Sea-Bands: Acupressure wristbands work for some women, and there is no downside to trying them
- Call your doctor if: You cannot keep any food or liquids down for 24 hours, you are losing weight, or you feel dizzy and dehydrated