The pill

Just started on the pill. I'm 20 years old. I've been sexually active with the same person for four years. For the past two of those years we've started sticking to the pull out method or tracking what days I'm fertile and avoiding sex during that time. My question may be stupid, given that I'm Catholic and my "sex talk" was based solely on abstinence, but can my boyfriend cum inside of me or around my vaginia now that I'm taking the pill . Also what are other women's body's responses to the pill? Weight gain and mood swings are my biggest fears. Any advice will help