Trimester Calculator – Track Your Pregnancy Stages
Trimester & Due Date Tracker
Enter the first day of your last period (LMP):
Here is a list of trusted sites and specific pages relevant to pregnancy stages:
Centers for Disease Control and Prevention (CDC) – Pregnancy
The ultimate authority on health data in the US. They have specific pages on “During Pregnancy” and prenatal care.
Office on Women’s Health (Womenshealth.gov)
A US government site dedicated specifically to women’s health issues, offering very accessible guides on pregnancy stages.
National Health Service (NHS) – Pregnancy Guide
The UK’s health service provides excellent, easy-to-read week-by-week breakdowns.
The American College of Obstetricians and Gynecologists (ACOG)
This is the professional association for OB-GYNs. Linking here shows you are referencing the standards used by doctors.
Mayo Clinic – Pregnancy Week by Week : One of the most trusted hospital systems in the world; their content is reviewed by medical professionals.
Specifically has great resources on the stages of pregnancy (trimesters).
Planned Parenthood – Pregnancy :
Provides clear, non-judgmental information about pregnancy health and trimesters.
