Unprotected sex & an agreement

Me(24) and my bf(31) have been seeing each other since Sept.2015. We had always used spermicide and condoms until I got an IUD in Feb.2016. We also agreed early on that if we accidentally get pregnant that we would get an abortion, because he doesn't want anymore kids(he had 2 by diff. Baby mamas) until he's married.

Well fast forward to last month, we found out my IUD came out!! And we've talked about marriage, in fact we agreed he will propose next year and marriageby he year after. We've been living together for 6 months with my 3yr old son.

Anyways... we haven't used any type of protection even when knowing the IUD is out and if I do get pregnant I want to keep it. I don't want an abortion, but I don't know how he feels about it anymore. I'm afraid to ask, but I've changed my mind. Before we were just getting to know each other but now we're planning a future together. We said an accidental pregnancy with birth control would warrant a termination because we weren't ready but now I feel it's a different story.

He KNOWS were not on birth control. He continues to cum inside regardless. Should I Bring up the subject? How do I go about this? I'm not pregnant but I'm fertile this week and we've had unprotected sex all week. Even if I'm not pregnant... I feel like it's important to state I do not want an abortion for the future. It's important that I've changed my mind.