Obsessive thoughts

I had a few pregnancy scares a few months ago and was extremely depressed and anxious getting by through that time and now I can’t even do anything sexual with my partner without thinking I could be pregnant when logically I know I can’t. We don’t have sex anymore and I’m also on the pill but I still get so anxious at the thought of me being pregnant. I feel like I can’t do somethings anymore without feeling happy. All I can think about is my fear of falling pregnant. What should I do? I’m seeing a therapist in a few weeks to talk to her about this