Obsessed with pregnancy post abortion

I honestly think I am going crazy. I had an abortion on Oct 11 at 6wks and 3 days. It was the absolutely worst moment of my life and I haven’t stopped thinking about it since that moment. It feels like ever since the abortion all I can think about it being pregnant and having a baby. I see pregnant people, babies, kids, etc everywhere I look. I cannot get it out of my head. It’s starting to bother me to the point I can’t sleep. I just can’t stop thinking about it, wondering what would have happened.... I’ve tried talking to my boyfriend about it but he gets really emotional and withdrawn when I talk about it. I know he regrets it and it’s difficult to talk about it.

Does anyone have any tips on how to stop this never ending regret? I just want to be happy...