I started birth control on December for my acne and got sick months before so I had to take antibiotics ever since my period is irregular and started to come a week after I finish the pill pack - I’m on the 21 pill - I had sex with my bf and my period came the next day, it was my first time and at first I mistook the bleeding with the hymen breakage, I bleed for 3 days, but according to the app it was my period and I think it was because of the characteristics, we used condom and he didn’t came inside me, I’m still on the pill, but I got scared of being pregnant. A week before my period was supposed to come I took a pregnancy test and it was negative and the day my period was supposed to come I had bleeding but just on that day. Should I be worried?