Didn’t take birth control for a month and now my period is MIA

I forgot my birth control over winter break and I started a new pack when I got to school, but I did it before my cycle started up again. Now my period is 16 days late. I’m starting my period week pills today, so I’m hoping I’m going to get it soon. I took 2 pregnancy tests and they both came back negative. Does anyone have any advice for me?