Pregnant

Used condom and was on pill but wasn’t super perfect about taking it, I was maybe about 20 minutes late a few days when taking the pill but I never missed one. Worried the semen slipped out when he took the condom off and then tried to put it back on. I tested 10 days later on day 2 of my BIRTH CONTROL period, so it’s not a natural period and it was negative. Could I be pregnant.