*Birth control/ Patch*

So I’m currently using the patch as a birth control. I change it every Monday. This is my week #1. I was taking a bath with my toddler and just like nothing I felt that my patch was off 😀 Yes, my toddler did it. I tried to put it back on but it won’t stay. So I put a new one. My question is, since I’m using a new one, what I’m going to do on week #3 ? If this patch supposed to be for week #2 Week #4 is the free week- when my period comes . help please ..! Thanks