i heard you start counting your pregnancy from the first day of your last period, is this correct? if i conceived, i would be 2 weeks, 3 days pregnant according to this model. (i ovulate before 14 days.) i am supposed to get my period in a week and a half. can i take a pregnancy test before then? i heard you can take a test 10 days after ovulation and it should be accurate. i missed 3 days of birth control and had unprotected sex.