Starting the pill the Sunday after period..? 🤔

I just got bc yesterday and my period isn’t supposed to come until July 22nd so she said start taking it the next Sunday since that’s a Monday, and I’m wondering once I do start taking it that Sunday after I finish my period, will it make my period come back? I’m really curious and forgot to ask her yesterday and Ik I can call and ask but I don’t want to bother and it’s closed today so I was wondering if anyone knows the answer pls thank you 💕💕💕