Birth control is not 100% effective, so if you don't want a baby, use condoms -- also to reduce the risk of STDs.
If you have taken it consistently without missing pills this month and preferably close to the same time daily, the risk is very very slim. If you haven't, then yes you have a pretty high sex. At your age, I would always insist he use a condom no matter what so there is far less risk of pregnancy. Plus, birth control pills don't protect against STDs and HIV/AIDS. Condoms do. You never know what someone is going to do. Don't risk your future!