Just finished first PP period and had unprotected sex!

Alright I need some opinions. I am 9 weeks post partum and I just got my first period 6 days ago. It was very light, no cramping or warning it was even coming. Lasted 5 days. Today (day 6) my fiancee and I had sex and he didnt pull out. It was an in the moment accident. I think we had been doing unprotected for so long, even before TTC (I had IUD) that he didnt think to pull out. I read that you are very fertile right after giving birth. My cycle is 28-30 days, very regular. period is about 5 days. When I was TTC I regularly checked my CM so I decided to check later today-at least 8 or 9 hours after the sex. Lots of clear ewcm with a tinge of brown (probably from period). Definitely not his stuff. I dont even know what to think. I also breastfeed but mainly formula since my supply is very low. Could the ewcm just be from end of period, or could it actually be an ovulation sign? Im an irish twin, id be shocked if I ended up having my own too!