Xulane Patch free week/light period

I’m on my last day of my patch free week, i put in a tampon and it barely fills up with blood, i’ve taken multiple pregnancy test to be sure and they all come back negative (with no faint lines). i’m wondering if someone could give my mind some ease and tell me it’s normal to have a light period on the patch. this is my first month using it after not using the patch for two months and this has never happened before . my period started friday night (i also took the pregnancy test that night and the day before), and has been soo light since then