Patch confusion

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Hey girls, I've been using patches for 3 weeks, from tomorrow I start my first patch free week. Because my period is quite irregular I've been told by the doctor to start the patches on any day because I don't know what day I can expect it. I have been using it since then but like 1,5 week later i got my period and since than I still have it. Today was my 10th day what I find a bit abnormal... Do you think it can be ok just my body went crazy with the hormons? Also, Is it normal to start using contraception not on the first day of my period??? Please let me know what you think! Thanks a lot!!