REGRETABLE MISTAKE!!! he came in me

I've been dating my boyfriend for 3 years. We've talked about how were 20 years old and DO NOT want kids now. He's made it clear that he never wants to come in me.

However, we have had sex a little without a condom, just to like tease, and then he would put one on.

With that being said, last night we took a shower together and things got steamy. He flipped me over and and put himself in me. Fine! Wonderful! Loved it! But then, he said he was gonna come and I told him "don't come in me, don't come in me". But it was breathy and we was in the zone. So he did. After, I told him that was great and sexy but lets go get plan B. But he was confused. He was confused because he he thought he put it in my ass!!

A huge HUGE communication error on our part. He told me he hates me a little. He said I kept something from him that only I knew about. But I thought we were on the same page!! I even told him not too, but he thought it was just gonna go in my ass!!! I feel like its all on my shoulders and it's all my fault, because I DID know and even though I said don't, I let it happen.

I don't know how to deal with this and how we can move forward from this. He is very upset (and so am I, but I can learn from his and move on). I just don't know what to say any more to him. Another major thing is, he came in me. It was my last fertility day, 8% of pregnancy and then I took plan B basically right away. I think I know that I should be fine, but I need some reassurance from kind strangers.

Thank you.