Please comment and help!

Amber

I have had this dark spotting, very light, and it has taken the place of my period . It’s not red at all. So Jan 31-3 , 15-18 And today ( the 28th) I’m spotting very light dark and I have unprotected sex every other day and I’ve been ttc for 8 months. Can anyone please comment and tell me if I could be pregnant or what it is ??