Weird questions

I'm 9 weeks pp. I had sex before I was cleared after getting my IUD. Literally like 3 days after getting it we had unprotected sex. And let's be honest the pull out method just doesn't work all the time. I know that chances are very slim but I was 5 weeks pp at the time of my IUD insertion and 5w 3d pp when we had sex and I'm TERRIFIED of the thought it was too early to have sex. Anyway. What was the first clue of you being pregnant before you took a test after your first c section. I've had a weird burning, pulling, dull ache on the right end of my scar and that was where I had the LEAST amount of pain and issues after my c section. Actually that's the side that healed 100% right away. I'm paranoid. 🤷 (I'm almost 50% breastfeeding and 50% formula feeding.)