Plan b?? Period???

I'm currently on beyaz, had unprotected sex on the 26th, but I missed a pill mid month (completely lost it) carried on with the rest of the month til my last active pill..instead of taking it the 22nd, I took it on the 23rd. I ended up taking plan b in less than 12 hours after having intercourse..I also started a new pack on saturday(25th) So far I've taken two pregnancy tests, Tuesday and Thursday then friday(first response), all negative. Did two more today (im having bad anxiety) My period is supposed to be tomorrow, Saturday and today I've had dark brown small blood clots, is this from plan b? Is it my period? Should I most likely be in the clear??