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Pregnancy: Week 1
The start of your pregnancy is measured by the last day of your most recent menstrual cycle. Due to this, you are technically not pregnant during the "first" week of your pregnancy. Therefore, you will not experience pregnancy symptoms. However, you may still experience PMS symptoms.
Due to the measurement of pregnancy using the assumption of you having a standard cycle, your estimated due date may not be accurate if you have an irregular cycle.
If you plan on remaining pregnant and raising a healthy baby, it is advised to take folic acid and iron supplements. When choosing prenatal vitimans, options with a minimum of .4 mg (400 micrograms) of folic acid are recommended.
External Links
- Baby Center: Layan Alrahmani, M.D. & Kate Marple: 04/10/2025: Fetal development week by week (https://www.babycenter.com/pregnancy/your-baby/fetal-development-week-by-week_10406730) - this is an interactive list of all stages of fetal development with diagrams
- Flo: Kate Hollowood & Sarah Biddlecombe: 06/28/2023: 1 week pregnant: Your guide to this week of your first trimester (https://flo.health/pregnancy/week-by-week/1-week-pregnant)
- Mother and Baby: Hannah Carroll: 09/04/2025: 1 week pregnant: symptoms, advice and what to expect (https://www.motherandbaby.com/pregnancy/week-by-week/one-week-pregnant/)
- The Bump: Lauren Barth & Kendra Segura, MD: 05/06/2025: 1 Week Pregnant (https://www.thebump.com/pregnancy-week-by-week/1-weeks-pregnant)
- WebMD: Traci C. Johnson, MD: Your Pregnancy Week by Week: Weeks 1-4 (https://www.webmd.com/baby/your-pregnancy-week-by-week-weeks-1-4)
- What To Expect: Catherine Donaldson-Evans: 07/29/2025: 1 and 2 Weeks Pregnant (https://www.whattoexpect.com/pregnancy/week-by-week/weeks-1-and-2.aspx)