My babys father is now requesting a dna test becuase he "added" up the dates and he is saying the baby is too big to be his from the dates we had sex( hes the only person i had sex with) theres no doubt its his but he just doesnt seem to understand how a menstrual cycle works 🙄  my last period was december 8 and we had sex December 27 . The ultrasound showed i was already 7 weeks pregnant on february 10 . Someone please help me i need another way to explain to this guy why they go off of our first day of last period i dont know whatother language  to explain it to him im getting so frustrated 😡