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# When does the first trimester end?

When exactly does the first trimester end and the second begin?

Asked by BisketLiss at 10:28 AM on Oct. 24, 2010 in Pregnancy

Level 18 (4,943 Credits)
• Your First Trimester: Begin week 1 till the end of week 13
1st Month = Weeks 1,2,3,4
2nd Month = Weeks 5,6,7,8
3rd Month = Weeks 9,10,11,12,13

Your Second Trimester: Begin week 14 till end week 26
4th Month = Wks 14,15,16,17
5th Month = Wks 18,19,20,21
6th Month = Wks 22,23,24,25,26

Your Third Trimester: Begin week 27 till Birth
7th Month = Wks 27,28,29,30
8th Month = Wks 31,32,33,34,35
9th Month = Wks 36,37,38,39,40

Answer by Mama2BabyTaurus at 1:03 PM on Oct. 24, 2010

• some drs say 14 weeks is the starting point b/c technically your pregnancy should last 10 months not 9

Answer by Kittty_Katt at 10:40 AM on Oct. 24, 2010

• at 12 weeks from conception you enter into the second trimester

Answer by Weldo1983 at 10:30 AM on Oct. 24, 2010

• 12 weeks.

Answer by mommaizzy at 10:43 AM on Oct. 24, 2010

• I've heard 12 weeks and I've heard 14 weeks. I remember trying to figure that out when I was pregnant too. I think it's officially 14 weeks, but the desire for symmetry makes people want to say week 12 or 13.

When Does Each Trimester Begin

Answer by pam19 at 11:19 AM on Oct. 24, 2010

• It end at 12wks and second one begin at 13wks.

Answer by Cassandre at 11:22 AM on Oct. 24, 2010