Birth control question!

Nicole • Mother of 1 beautiful baby girl 1/08/18💜🌙✨

So my method of birth control is the patch. So I finished my third week and had my period for my “off week”. I had unprotected sex on Saturday and I put on my patch 12:20 am Sunday going into Monday.

Does the patch prevent pregnancy during the “off week”? I read somewhere that it does but I want a second opinion.

Does it matter that I put the patch on 20 minutes going into Monday? My patch change day is on Sunday.