Confused!!!

Basically, I was on the depo injection for 3 months and then got put on microgynon (pill) but only took it for a week as it didn’t suit me at all. After I stopped taking the pill about 2 weeks later I had a 7 day bleed which seemed just like a normal period and that finished on the 17th of September. Therefore basing it on a normal 28 day cycle AF should of came on the 9th of this month.. no sign yet though. My issue is that I’ve had moderately bad stomach cramps for the past 6 days, extremely sore&tender; boobs and quite bad lower back pain. I’ve done a couple of pregnancy tests and just get a BFN. anyone got any kind of insight of what could be going on or what I can expect?? I feel like I may have ovulated because I had EWCM for 2 days and glow is saying it was around the 29th so surely if I was pregnant it would come up by now? Any responses would be super appreciated!!