Very light pink spotting?

Nickie • 28. DH 27. Lost our baby girl at 24 weeks ?Hoping for our rainbow ?
So I'm not really sure what's going on with my body lately. Had AF on my own from May-July after going off BCP in April. Didn't have AF in August or September. I was due for af at the very end of September. 
​Pretty sure I had a cyst just about a week and a half ago, I'm pretty sure it went completely away. Went on vacation last week with DH & we BD'd almost every night but one from last Friday to Wednesday. On Tuesday, I started to have light pink spotting. I put in a tampon thinking af was coming.  It would come and go, no cramps or pain. It kept on for about 3 days, and today really don't have it anymore. 
​Obviously it's too early for it to be implantation, as it would only be 8 days at the earliest. I can't remember when we DTD before we went on vacation either, I'll look back and see. 
​I don't track ovulation either. Anyone else have this happen? Could it just be from having so much intercourse? Thanks ladies!