AF a week early and now spotting- HELP

Cortney • Army wife. Wrestling mom. Dog lover to a boxer.
So my period was not to start until tomorrow 1/2, it started last Thursday- spotted for a day, medium flow for one day then lite for the next two ( my period is normally 7 days) this period it was only three days long. Since I finished my AF a few days later I spotted two different days - then it stops....
No cramping. 
This is not normal for me- normally AF last 7 days and 5 of them are very heavy flow days. 
Before AF I could of sworn I was pregnant- I was super nauseous and nipples were killing me. I've done tests and one looks invalid and the other is negative. 
I am just wondering if any other ladies have had such a dramatic change in their flow while TTC.