This little pregnancy wheel is one of the most important tools we use in early pregnancy. Here’s how it helps us calculate key dates 👇 1️⃣ Gestational age Pregnancy is dated from the first day of the last menstrual period (LMP) — not from conception. The wheel helps us determine how far along baby measures at the time of ultrasound. 2️⃣ Estimated due date Using the LMP, the wheel calculates an estimated due date based on a standard 40-week pregnancy. 3️⃣ Narrowing down conception timing While w