Can plan b affect the patch?

So I took plan b about 7 days before I got the patch and I was on day 2 or 3 of my period when I started it. Now, I already had a period that month and since I took plan b it gave me a really early period. But now I am on my first patch free week and I still haven't gotten my period but I have all my normal period symptoms. I was extremely safe this month as well so I'm not worried that pregnancy is the issue. Just wondering if anyone has dealt with something similar or knows if this is normal?