Plan B

Quick question. I ended up taking Plan B in Nov and received my period for 5-7 days in December which is around the normal time I get it. It was bleeding like a period, heavy and I had bad cramps the day it came. I’m on the birth control pill so I get my period during my placebo week. If you are wondering why I took Plan B when I take the Pill perfectly, sometimes a couple hours late but never missed a pill once, it’s a long story I’d rather not share because it was traumatic for me. Anyways, I am on my placebo week now (started 1st pill today) so should I expect my period to come this week or could it be thrown off due to all the hormones?