BC & plan B question:

So I started taking BC for the first time this past month. Before I started it, my periods were very regular and always on point. I skipped 2 pills in the cycle and had a little spotting each time I missed one. I also took plan B at the beginning of the month. I also have a UTI currently (lot of issues here, lol). I'm 9 days late and have already started a new pack of pills.

Is the missed pills, plan B & UTI the reason for my period being late? It's kind of stressing me out.

I don't really think I'm pregnant as my partner has never once finished inside of me, the plan B was only taken because of him being extra paranoid.