Nervous about sex 😬😬😬

Alright so I was in a four year relationship with my ex fiancé and he was the only man I had ever had sex with. We had our daughter and then a few months ago we split because he cheated. The past few weeks I’ve been casually talking to this new guy and honestly I kind of want to have sex with him haha but lord am I nervous!!!! I only had sex with my ex and now my body is all different from giving birth and I have all this thoughts just running through my head. Ugh has anyone been in this situation??