Should I play it out???!

My boyfriend is a little younger then me and I want a baby, we talked about this before and of course he said he would be okay with it. When we have sex he cums in my all the time. I didn't get my period for over 45 days. We thought I was pregnant but turns out I'm not. However we was telling me how excited he was and bla bla bla then he comes out with I would be sad if u were. So then I told him well I'll just be in the pill. He doesn't want me to be on the pill and he doesn't want to have a baby but he always still cums in me. So my question is should I just start on BC or should I just let it play out and see when I have a baby???