I'm so scared I might be pregnant....

So I'm supposed to be on my period right now. I had unprotected sex but he said he wasn't even close to finishing and he said he didn't feel any pre cum. My boobs are kinda sore but don't look any different and that's kinda normal for me since I have large boobs. I also feel a bit cranky but not a lot. But I'm really nervous I haven't felt any other symptoms. It's been about 3-4 weeks but I'm just really nervous. Any tips cuz I'm just scared out of my mind right now.