Plan b

I took plan b 10 minutes after sex and 7 days before ovulation (according to the app.) i had spotting a week after it even had clots and a little heavy but it was lighter then my normal period and ended in 3 days. It’s been like 2 weeks from then now my periods late. I’m confused. I read the pamphlet I know it causes ur period to be early or late but just worried.