Hey there~ since you're on the pill, you should be fine. That said, 99% effectiveness is not 100%, so there's always a small chance that you are pregnant. Check with your doc, and take a home test, just to be sure; from there, you can discuss age-appropriate options with your MD.
A few things~
1. The fact that the condom is constantly slipping off your boyfriend's penis means that it's too big for him. Bag the oversized ones, in favour of a snugger fit.
2. If the sperm poured all over him, not you, and had no contact with your vaginal opening, pregnancy is unlikely.
3. Re: the bleeding after sex~ sounds like you were a virgin when this happened, so chances are that it's just blood from the hymen tearing~ many women experience this their first few times, and it's normal. If it continues, you may want to check with a doctor.
Cheers!