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lilylovesgaming1986 If you're keeping it, he deserves to know and also that he will have to pay child support.
Maybe it is strange showing up at his door and telling him you're carrying his child, but a one-night stand with a guy you just met is also strange. The two go together and if he freaks out, that's his problem. I'd recommend going with a friend.
Seriously, if it was me, I'd like to know. Unless your plan is to just send him the bill after the kid is born. Although I wouldn't want to bring a kid into that situation, if I can be frank with you.
You're in your late 30s, and this is your first kid? Although I'm my parents' oldest child and my mother was 38 when she had me.