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

Due dates for a May 2027 conception

A pregnancy lasts about 266 days (38 weeks) from conception, so a May conception leads to a due date in January or February. 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.

An early-summer conception: what it means for you

Conceiving in May means a winter baby, due in late January or February. Your first trimester falls in early summer — light, long days can help with tiredness, though heat can make nausea worse. You would be in the third trimester through the darkest weeks of winter, so plan for icy pavements and keep your hospital bag ready early.

Seasons and timing

With conception in May, the first trimester runs until about July, the second trimester covers the months after, and the third trimester begins around October. In the northern hemisphere, that puts the last weeks of pregnancy in autumn and the birth in winter (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 May could be born in the month before or after the due month. Your baby’s birthday is most likely to fall between Jan 1, 2028 and Mar 6, 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.