hi by any chance did you have unprotected sex around april 24? if you was already pregnant the plan b would not work when you took it in may this could be why your dates are out perhaps its april 15 that your calculator is trying to get to? hope this helps you good luck ps so you never thought of bc?
12 weeks pregnant due jan 20th. last period april 15th. had sex may 2nd and on april 15 during cycle. whose father? . i did pregnancy calculator i'm guessing it's about 95% may 2nd but still nervous. jan 20th minus 38 weeks equals april 29th 30th but had sex on may 2nd. but than also took a plan b pill on may 4th (about 45 hrs later) and still got pregnant.