Confused about Period

I have currently been on birth control for around 4 years, and I have always taken it daily without ever missing a pill. Currently, my last period was in October and now I am worried. In November, I had thrown up so I decided to stop taking my birth control the week before my period week. Because I did this, I think I messed up my period because it never came during my period week. I started a new pack when I was supposed to, and I did end up missing 1 pill during the 2nd week of my pack. I was also taking amoxicillin during the 2nd week (but I’ve heard amoxicillin doesn’t effect birth control and only certain antibiotics do). I am on my 3rd week, but I was sexually active this past weekend. I am curious what I should do if I don’t get my period next week? I am more worried about my period being messed up than being pregnant. I am 25 years old so my periods did come every month until I skipped the 5 pills in November and now I haven’t had it since. I have included a timeline below if it’s easier to understand.

- October: Period was week of 10/16 then started new birth control pack week of 10/23

- November: Skipped 5 pills on the week of 11/06 and never got period week of 11/13. Started new pack week of 11/20 and then missed one pill on 11/27 and was also taking antibiotics started on 11/28

*was not sexually active during October or November

- December: Had sex on 12/02, 12/04 and 12/05. Stopped antibiotics 12/05. Period is supposed to be week of 12/11.