Four weeks along is in the first trimester. The first trimester ranges from week 1 - week 12, or the first three months.
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)
Well, assuming a gestation period of 9 months, as in humans, each trimester would be three months. Sixteen weeks is 4 months so that would be the second trimester.
Well, you would be 18 weeks pregnant. 14 weeks is the begining of your 2nd trimester so you would be 4 weeks into your second trimester. Or you would be 4 1/2 months along.
12 weeks is considered the end of the first trimester.
Here is a simple breakdown of weeks to months to help keep you on track: Weeks 1-4 - Month One (First Trimester) Weeks 5-8 - Month Two (First Trimester) Weeks 9-13 Month Three (First Trimester) Weeks 14-17 Month Four (Second Trimester) Weeks 18-21 Month Five (Second Trimester) Weeks 22-26 Month Six (Second Trimester) Weeks 27-30 Month Seven (Third Trimester) Weeks 31-35 Month Eight (Third Trimester) Weeks 36-40+ Month Nine (Third Trimester)
There is also 12 weeks in the second trimester
6 months 3 weeks 6 months 3 weeks
17 weeks is 4 months - one month into the second trimester.
It is the fourth week of the third trimester.
13 weeks and 3 days are 1 trimester for school
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. :)