Cramping & Spotting

Caila
Hi Ladies,
So AF isn't due for another week. For the last 5 or 6 days I have had some on and off spotting. Sometimes light pink and sometimes browish. My husband and I have been TTC for about 9 months now and my first initial thought was maybe implantation but my cycles are all over the place, so who knows. 
Ironically, I have an appt at the OBGYN just to talk about fertility, maybe get blood work, etc. I made this appt like a month ago, so it's fitting that it's falling on this week. Ideally, my hope is that I am pregnant and that's what I'm told at the appt. But my question is, what do you think this cramping and spotting can be? Or just any similar experiences? Advice? Thoughts?