I missed a few pills on different days

Also I have bad lower back pain and a little more tiard. I have 2 other kids 3 and 4 and the 1st thing I knew I was pregnant was my breast change. I got pregnant with my 2nd on depo I was also breastfeeding so I know I can be very fertile. Thanks for you help:)

I am sorry, I hit enter and it posted it before I could go into detail. I missed 1 pill in the 1st week (im on yaz) then I missed a pill in the 2nd week had sex the day after (took a pill on the day I had sex) then took my pill the morning after but then missed the next 2 days. I had spotting right after which I know if from missing. It only lasted maybe 2 days. So being fusterated I went ahead and just skiped the last week I only have 4 placebo pills so I skipped 3 days I think, I wasnt having sex. So when it came time for my regular period it never came. I started a new pack on sunday and nervous about it. I took a pregnancy test saturday night before I started my new pack and it was negative. I also took another one this afternoon and also neg. I am having cramps like I should be getting it but not even a spot. I also have a tiny bit of nausea espically to smells (could also be anxiety) I am peeing more, but no sore breasts. It fusterating not knowing whats going on with my body. I have skipped pills before cause I am not usually sexually active, and I would have spotting then a regular period at the right time.

Can you be more specific regarding what your question is? Are you worried about pregnancy, or just your menstrual cycle being irregular?