Why is he acting distant now?

So my boyfriend of two years said he wanted a baby with me. So him and I had unprotected sex the week I ovulated. Ever since I slept over his house he has been acting distant with me. It’s too late for me to take a plan b. He told me he would talk to me. He sent me that message at 7pm. He blocked me on Snapchat but didn’t block my number. I don't know why he is acting like this. I don't know if I am overreacting or not.

Why is he acting distant now?
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