How much can I trust the pill??

Ivory
Me and my boyfriend don't use condoms-like EVER. We've been having sex for a while now and his pullout game is impeccable but I still get nervous every month. So, being the responsible adult I am, I took it upon myself to make an appointment at Planned Parenthood to get the pill. We are going next week for the appointment and get the first set of pills. Ever since I've made the appointment my boyfriend has been talking about how great it is going to be when he can cum inside me and I'm not going to lie-the thought of it turned me on. So now we get to my question: how dependable is the pill? Like I'm not saying we are going to go completely crazy and finish like that all the time, but is it reliable enough to do every once in a while and not get pregnant? All answers are welcome. And if some of you have gotten your birth control pills from Planned Parenthood that would be great.