Period problems? HELP

I had to change my birth control brand for this month (forgot to get a new prescription for this year, so currently on emergency birth control), I’ve been on my normal pill cycle - I didn’t have to skip any days of pills.

I have not gotten my period this month and I’m concerned. I’m not sure if the change in brand has anything to do with it? I’m 4 days into the placebo week (I don’t take the sugar pills), and I usually get my period at least 3 days into the placebo week.

I’m sexually active, and always use condoms. Anyone have any idea what’s going on??