the third trimester
Usually at the third trimester.
First trimester: 0-12 weeks (so 12 total) Second trimester: 13-28 weeks (so 15 weeks total) Third trimester: 29 weeks-40 weeks (so 11 weeks total)
2nd trimester
It is the fourth week of the third trimester.
the second trimester
First trimester.
There is no fourth trimester. The first trimester is the first 3 months, the second trimester is months 3-6, and the last is months 6-9.
If there's nine months in a pregnancy then divide by three to get a trimester. Therefore there are three months in a trimester
3rd trimester
in the second
just to let you know the first trimester starts from 0-13 weeks and the second trimester is from 14 weeks to the 28th weeks and the 3 trimester from 29 weeks to 40 weeks or whenever you deliver they are not all equal the 2nd trimester is the most difficult and the longest with the last trimester actually being your shortest. Good luck with your pregnacy. :)