I'll give you some practical advice for tonight, as he is obviously coming over and you're obviously going to fuck him.
Grow the fuck up and use contraception. Your period is due 11th Jan, you're fertile.
Yawn to "that's not really a concern, it's not going to have happened".
I'm tempted to point out that a man who doesn't pull out isn't actually carried away with what a good fuck you are, it's a man who is utterly disrespectful of your "contraceptive" choices, and you.
You say you're not teenagers, but only teenagers think withdrawal is a decent enough method to use.
But it's pointless saying it, because you KNOW it.
You want to be pregnant by him, because you want to tie him to you. It's very sad.
You are an utter idiot for not taking the MAP.
That your utter idiocy is because of your fragile mental state makes me sympathetic.
But whether I can sympathise with you ending up in this state off your meds (my own mother goes fucking crazy off hers) or not, fact remains, whatever drives the idiocy, it IS idiocy to risk pregnancy with this man.