Period SUPER late! HELP!

Hey girls, I’d like some help here cause I don’t know if this has happened to any of you before... okay so, about 2 months ago more or less, I took a plan B pill after having sex. 2 weeks after taking it, I got a light bleeding that lastef for about a week, and it showed at the same time I was supposed to get my normal period, so I assumed it was that, just a bit lighter than usual. But now, fast forward to 28 days after that, I didn’t get my period. I waited a week cause I assumed it had something to do with the plan B pill cause I know it makes your hormones go wacko. But now it’s almost 3 weeks late and I still haven’t gotten it. I’ve taken 2 home pregnancy tests and 1 blood test and they all came negative so the pregnancy scare is out of the way, but now I’m just wondering if any of you have experienced something like this after taking the plan B pill?? Please let me know!!