I think he's trying to get me pregnant

I suffer from cluster headaches and I cannot go on birth control. We've been living together for 8 months and we use the app to work around my ovulation and use some forms of birth control but he knows I'm ovulating this week and he's all over me. I'm not doing anything to turn him on more and I keep telling him I don't want kids and he seems to think I'll change my mind about kids once it happens. Am I being paranoid? He's all over me and I got carried away with him the one night and had sex three times the one night.

* I also cannot go on an iud my doctor will not allow it until I'm atleast 25 or have had kids because she said there is a high chance it will cause infertility or bind with my uterus because of my uterus shape.