Worried, worried, worried.

I had unprotected sex the day after my fertile window. I took Plan B one step within 36 hours after the incident. (Note: the guy didn't go inside of me, but I'm still concerned about pre-cum) It has been about a week and a half since I took the pill & I haven't had any spotting, but I've had white discharge. I've also had some light cramping & occasional sharp cramping, & constant nausea, but that could be from me stressing so much about this situation.  My period is due tomorrow but I'm still very concerned about being pregnant due to the fact that I've googled every symptom I've had & ive also read that plan b doesn't work if you've already ovulated. Is it to early to buy a test? I've also read that plan b can cause your period to be late. I've taken plan b two other times over the past 4 years & those two times I've spotted a week after taking it, & this time I haven't. I could just be worrying myself to death but I need some advice! HELP😩