PLEASE HELP! WHY AM I BLEEDING ?? PREGNANT ??

Had sex for the first time was , on March 12 and 14th. Was protected, Condom, On the pill ( use this religiously) and he didn't cum we made sure we were extremely safe as I have an anxiety disorder. Had my  (( was on the inactive pills)) period between the 16th and 20th of March. Since last Thursday 31st March I have been bleeding (light to medium) yet quite a bit some days. What The hell does this mean?? It's never happened before, and I've been on the pill for 6 months and this has never happened??  It is not an STD as we are both our first sexual encounters/partners. Please help? Am I pregnant ?? Is this caused by the pill?? I can only go to the doctor if it is an emergency as my parents are very very strict! Please help!!! Any help would be great!!