Calculate the weeks, months and quarters of your pregnancy

When a woman becomes pregnant, visits to the gynecologist or midwife begin. Many expectant mothers feel confused when it comes to calculating the stage of their pregnancy, since there are different ways of counting it: by trimesters, by months and by weeks. Since it is very difficult to calculate th

When a woman becomes pregnant, visits to the gynecologist or midwife begin. Many expectant mothers feel confused when it comes to calculating the stage of their pregnancy, since there are different ways of counting it: by trimesters, by months and by weeks.

Since it is very difficult to calculate the exact date of conception, the date of the last menstruation is usually used as reference date. As of that date, 40 weeks, 280 days, are counted to establish the probable date of delivery.

Obstetricians count in weeks, and this is how pregnant women usually do it, but what month corresponds to each week of pregnancy? In what trimester of pregnancy are you according to your week of pregnancy? Solve all your doubts.

Quarter, month and week of pregnancy calculator

First trimester

The first trimester of pregnancy covers week 1 to 13.

MONTH	WEEK
1	1-4
2	5	6	7	8	9
3	10	11	12	13

Second quarter

You will be in your second trimester of pregnancy between week 14 and 26

MONTH	WEEK
4	14	15	16	17
5	18	19	20	21
6	22	23	24	25	26

Third trimester

The third trimester of pregnancy begins at week 27 and ends at 40, although it can be extended to 42.

MONTH	WEEK
7	27	28	29	30
8	31	32	33	34	35
9	36	37	38	39	40