Pregnant or AF Soon?

Ti
I have been spotting for 6 days now. It started 8 DPO and now I'm 13 DPO. I doubled my chlomid this month to 100mg and also added 200mg progesterone daily following ovulation. The spotting is dark brown and I only notice it when I wipe. At first I thought it might be a sign of an early period (sometimes I spot a day or 2 before), but there's no pink/red blood or need for a tampon. AF is due on Dec. 3 (33 day cycle).
Could I finally be pregnant or will AF be here soon? If you experienced extended (longer than a couple days) of spotting, please comment below!! Thank you so much!