Interactive Pregnancy Calendar

How Pregnancy Weeks Are Counted

Pregnancy is measured in weeks starting from the first day of your last menstrual period (LMP) — not from the date of conception, which typically occurs about two weeks later. This means you're considered "4 weeks pregnant" at around the time your period would have been due, even though conception happened roughly two weeks prior.

Trimester Milestones

• First trimester (weeks 1-13): Major organ development, higher miscarriage risk window, common nausea and fatigue
• Second trimester (weeks 14-27): Often called the "golden trimester" — energy returns, baby movements begin, anatomy scan occurs
• Third trimester (weeks 28-40+): Rapid weight gain, birth preparation, more frequent prenatal visits

Making the Most of Your Pregnancy Calendar

A week-by-week pregnancy calendar helps translate your due date into a concrete timeline of what's happening for both you and your baby, alongside key appointments and screenings you shouldn't miss (first trimester screening, anatomy scan, glucose test, and more). Bookmark this page and check back weekly — your calendar updates automatically based on your due date, so the guidance stays relevant as you progress.

Key Appointments to Plan Around

Alongside routine monthly visits, a few appointments are worth marking on your calendar specifically: first-trimester screening (weeks 10-13), the anatomy scan (around weeks 18-22), the glucose tolerance test (weeks 24-28), and Group B Strep testing (weeks 36-37). Knowing roughly when these fall helps you ask the right questions at earlier visits and reduces the feeling of surprises popping up unexpectedly.

Using the Calendar Alongside Your Own Symptoms

While the calendar gives you a general sense of what's typical for each week, your own experience may reasonably differ — some weeks might feel more intense than the calendar suggests, others milder. Use the weekly guidance as a helpful frame of reference rather than a strict checklist your pregnancy needs to match exactly, and always bring up anything that feels off to your provider regardless of what "week" you're supposed to be feeling it.