First Trimester: Weeks 1–12
The first trimester spans weeks 1 through 12 and is a time of rapid, invisible change. Your baby develops from a single cell into a recognizable human form with a beating heart, forming limbs, and all major organs.
Common Symptoms
- ●Morning sickness and nausea
- ●Extreme fatigue
- ●Breast tenderness and swelling
- ●Frequent urination
- ●Food aversions and cravings
- ●Mood swings
- ●Light spotting (implantation bleeding)
Key Tests and Screenings
- ●Home pregnancy test (week 4-5)
- ●First prenatal visit and blood work (weeks 7-10)
- ●NIPT screening (week 9+)
- ●NT scan and first trimester screening (weeks 11-14)
Tips for This Trimester
- ●Start taking prenatal vitamins with folic acid
- ●Stay hydrated — small sips throughout the day can help with nausea
- ●Get plenty of rest — your body is working hard
- ●Avoid raw fish, unpasteurized cheese, and deli meats
- ●Consider when you'd like to share the news
Your Week-by-Week Breakdown
Find out which week you're in
Calculate Your Due DateNote: This calculator provides estimates based on standard medical formulas. Please consult your healthcare provider for personalized guidance.