Ultrasound best.: First trimester ultrasound is the best way to determine the due date for any pregnancy (with the exception of ivf/art, when the infertility specialist can establish the due date by the date of fertilization and embryo transfer). Your doctor appropriately changed your due date by 8 days (ovulation erratic), so i would suggest to you that conception occurred around the 13 of march. Folic acid 1-5 mg.
Answered 6/25/2014
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