Pregnant while on Patch?

I'm being completely paranoid but this is ending my third month of using the patch. I'm on my off week/period week. The other months I'd take it off Wednesday and by Saturday I'd have my period, have it thru Monday/Tuesday and then re-patch Wednesday. 
But it's Saturday night and I feel fine. Soooo my minds getting concerned there may be another reason it's delayed 😬. 
Does anyone have experience either getting pregnant while on the patch or having a delayed/missing period?