Bleeding from toy or implantation?

Okay, so my husband and I decided to spice it up in the bedroom and bought a dildo. It is about the same size as he is. We used this Saturday and Sunday. Well now on Tuesday I just went to the bathroom and saw some faint blood/discharge on my toilet paper. Only on the first two wipes. Mind you I haven’t had a period since November due to some medical problems. We haven’t been using protection since last August as we have been TTC. Could this be from the toy or implantation bleeding? Anybody ever have this before from toys and have any tips?