Scared I’m pregnant

I had unprotected sex with the withdrawal method on day 11 of my 29 day cycle. We did it twice in a row without him going pee. I was suppose to ovulate on day 16 but didn’t get egg white discharge until day 19. Is it possible that I happened to ovulate later than normal which would mean any sperm that could have gotten in there would have died by then? I didn’t use plan B because I was unaware that sperm could still be in there after a previous ejaculation. I’ve been having so much stress and anxiety over this which may cause me to be late for my period even if I’m not pregnant. I’m supposed to get my period September 4. I’m young and I really don’t want to be pregnant. I’ve learned my lesson for sure.