Pinkish red discharge 7 days past trigger?

This cycle I took Letrozole on CD3-7, did a HCG trigger shot last week and BDd the next 3 day's. After that I took progesterone and will continue until BFP or AF. Yesterday at 7dpt so about 6dpo I wiped and had a streak of pinkish red discharge. This was after some cramping. I thought for a second AF started early but realized I still have 6-8 days to AF. The next bathroom brake there was nothing and hasn't been no color since. I'm hopping its implantation but implantation is pretty rare anyways. I wasn't felling confident this month because my follicles were small but I guess I'll see in a couple days.