am i pregnant? give me opinions & tips!!

about three weeks ago, during my ovulation. i had unprotected sex & he came in me. i took a plan b but didn’t experience any symptoms and later looked it up, plan b says it doesn’t work if you’re already ovulating. i’ve been having extremely tender breasts, more than ever. stomach pains galore, random cravings. exhausted more than anything, sleeping all the time. my period is 4 days late, and i’ve been having creamy ish white discharge. sometimes i feel like imdefinitely pregnant and other times i feel like maybe i’m not? what should i do & how would i tell? i have a doctors appointment thursday, but i just wanna know now!!