Need Advice - AF or Implantation Bleeding??!!

Rachel
So my husband and I have been TTC for about 8 months now. I have a pretty hectic work schedule (55+ hour workweeks and once a month travels) so syncing up is hard. We use ClearBlue Digital to help determine ovulation Windows. This said, around the same time that we started TTC, my cycles started getting weird - super heavy, debilitating pain, sometimes coupled with 103 degree fevers, and lasting 10-14 days. I have seen doctors for it and they have ran thyroid tests, SIS, blood work and everything has been normal. Glow has always been pretty spot on predicting the start of my period so I was hopeful that since I started light spotting a week before my next period that it was implantation bleeding. I kept getting on and off again spotting (never enough to go above Pantyliners) for about 4-5 days and it stopped. My period was supposed to start yesterday but no sign yet. I took a pregnancy test and BFN. Do I count the weird spotting as my cycle for the month or should I try to take another pregnancy test after a few days? I am so confused!! :-(