unprotected w/ birth control

Hey, this is my first post. I take Yazmin and have a long term boyfriend. We haven’t had vaginal sex yet, but I really want to. Is it okay to not use a condom? My boyfriend definitely doesn’t have any STDs, and I don’t either. I also am always on track with taking the pill. The problem is, I’m overweight, and I heard that can cause the birth control to fail. I just want some comfort that it would be okay haha.