Period after pill

I just started back my birth control a little over a week ago and my period was supposed to come two days ago and it has not come. I took two pregnancy test and both came back negative and I also use a condom while having sex majority of the time. There was this one time he took it off before he finished and I’m just worried maybe by some change pre cum got left inside. But I take my pill everyday at the same time and I took 2 pregnancy test and both came back negative. Should I be worried ?