This little adventure...

So Hubby and I have been TTC baby #2 for quite some time now. My period was due to start on Friday January 12, 2018, and it did start, but has only been brown spotting with no clots. It’s just enough that I need a panty liner. I have had some cramping, but nothing crazy. I took two pregnancy tests in the week before my period and they were negative, and I took one two days ago, and it was negative as well. I called my OBGYN and they said nothing to be concerned about at the moment, it’s just a wait and see thing. This is absolutely driving me crazy! I have had some pregnancy symptoms, but no PMS symptoms. I just want to know for sure what’s going on.