Trimester definition: You don't need to know your LMP if you know your date of conception (the day of transfer). You know you are 13 weeks. Trimesters are defined only by weeks gestation: 0-12 is first trimester, 12-24 weeks is second trimester, and 24-40 weeks is third trimester. So at 13 weeks you are early in your second trimester. Congratulations!
Answered 2/13/2015
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