SCARED. am i pregnant or .

so on feb 28th, i had sex w my bf. a little bit of his semen got on my outer part of my vulva. but i wiped it away asap cause i freaked out. i’m confused now, cuz on my flo app, it said i was still ovulating on the 28th, but here on the glow app, my chances of getting pregnant was low and i wasn’t ovulating.? my period should come in a week. i did take plan b before 72hrs was up. it’s been 3 days since i took plan b. and ik they can have symptoms too. i have mild to kinda moderate cramps, backaches, breaking out a little, i get headaches/migraines here and there, my appetite hasn’t increased nor am i craving for anything. my breast just look a little bigger (not sore or anything.) and my discharge is like damp, dry, sticky, tacky with little to no CM on it. idk if i’m pregnant.? but i feel like it’s way too early to tell, but i’m not sure.? when should i test.?