I can’t be pregnant- can I!?

So I started the patch on the Sunday of my period (still had it). We waited 7 days and then had sex multiple times throughout the month unprotected. The insert said 7 days but my dr said 30 days...anyway I figured the insert was fine. I took off my patch Sunday and no sign of my period. It’s my first month on birth control ever. Is this common? Common to miss a period? Thanks

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