Heart breaking ttc

I had sex so much during ovulation that I even had it 2 days after my period and what not. But I got a strong feeling im not pregnant. 🥺 did anyone really know if they are pregnant right away? Or thought they weren't, and ended up being pregnant?? Like iv been having signs but im not going to read to much into it cuz im like this cuz of pcos. So it hard to determine if these signs are pregnancy symptoms. Ugh. Anyone got some insight on this? Or if its normal to feel this way?