New BC Pill, Late Period

Okay, so this past month I've been on a brand new birth control pill (LoLoestrin) because my previous one was causing reoccurring yeast infections (yeah it really fucking sucked). I usually don't take the last row of pills because it's usually placebo or just vitamins. I took that last row a week ago from today and no period yet. Definitly got my period before taking the new pill. Before the new pill I had sex maybe once that past month, and we do what we usually do which is no condom and pull out. So at what point do I start freaking out? I mean I'm freaking out but at what point do I need to seriously consider grabbing a pregnancy test? Agh 😨😵