Weigh the risks. You'll gain more than 30 lbs if you get pregnant. And he should be wrapping his tool either way. I was conceived while my mother was on birth control as well as my brother. All of my xs have taken it and they did not seem that effected by it weight wise. Plus if he really likes you a few extra lbs shouldn't be that big of a problem.
Some are dying to conceive, some are killing the conception. God help us all :)
Ironic. If it weren't for shots, a lot of people wouldn't need birth control.