If I Get Pregnant in March, When Am I Due?

Due dates for a March 2027 conception

A pregnancy lasts about 266 days (38 weeks) from conception, so a March conception leads to a due date in November or December. The table gives the estimated due date for each possible conception day, and the date a home pregnancy test is usually reliable — about two weeks after conception, around when the next period would be due.

Dates for 2027. In other years the due date is the same or one day different, depending on leap years.

A spring conception: what it means for you

Conceiving in March leads to a due date in late November or December, so your baby may arrive in the busy run-up to the end-of-year holidays. Plan ahead: hospital and community services run as usual, but family travel, shopping and work deadlines all bunch up then. Your second trimester covers early summer — a good time for any trips before the final months.

Seasons and timing

With conception in March, the first trimester runs until about May, the second trimester covers the months after, and the third trimester begins around August. In the northern hemisphere, that puts the last weeks of pregnancy in autumn and the birth in autumn (the seasons are reversed in the southern hemisphere). Autumn’s cooler days often make the final weeks more comfortable; it is also a good time to ask about seasonal vaccines.

Because most babies arrive between 37 and 42 weeks, a baby conceived in March could be born in the month before or after the due month. Your baby’s birthday is most likely to fall between Nov 1, 2027 and Jan 5, 2028.

Conception dates are estimates

Few people know the exact day they conceived. Conception happens within about a day of ovulation, which can be up to five days after sex. If you know the first day of your last period, the Due Date Calculator is the standard method. For any month at a glance, see the Conception Due Date Chart.