Spotting

Stephanie • My husband and I are TTC!!! I was diagnosed with PCOS in 2011 (I think)! Need baby dust!!!! ☺️
Hi ladies! 
So My husband and i have been TTC for about 7 months now and I have been having my period every month around the same time. Went to get my yearly pap and the doc out me on prenatals he also said it sounds like I am ovulating and he doesn't feel any cysts. Anyways this last month I missed my period I am now 3 weeks late, taken test and all neg. my regular doc took a blood pregnancy test and neg but now I have been shooting for a week straight, it is only when I wipe and if I wear a pad nothing is on it. Some days it's more then others. I am just not sure what to do. I have an appointment with my OBGYN next Monday but wanted to get any advice from you all! 
Much appreciated! Thanks!!