How’d you know if you were pregnant ? Did it feel different?

Me and my partner have been trying for a month to have a baby.

Backstory: I have PCOS and Ive done research on how it can cause infertility . Before we decided we wanted to try we had sex earlier last month and I took a plan b (before my fertile window) a couple days after we talked about it and decided we wanted to try. We were sexually active my whole fertile window and after and I missed my period but idk if I am pregnant mainly because maybe the plan b messed up my cycle ? Or the anxiousness is stressing me out to where I’m missing my period all together .

So I just want to know what it “felt” like the first couple weeks or if you even knew. Were there any differences that you noticed in your body? Mood/health/skin wise?