I had sex in late March, (its now mid May) and he used protection, and I don't think there was anything wrong with the condom. He also didn't finish. Then, in April I got my period, but it was only 3 days and really really light. Now my period for this month is late. I lost my virginity that night, and I've heard that that kind of messes with your system. I took a pregnancy test the other day and it was negative. How likely is it that I could be pregnant? Because I'm fifteen, so I don't want to go to Planned Parenthood and possibly pay for anything if I end up being not pregnant, and I obviously don't want my parents to know.