Bleeding after sex

Ok so I came off my period 3 days ago and had sex on the eveningi came off and no blood well this evening I had sex again and there was a pinky blood mixed in with man fluid (tmi I know we're trying for our first) it wasn't a lot just enough that I noticed it was coming out of me when I went to the toilet it wasn't very bloody just very pink I am going for a check up for endometriosis soon and was just wondering if anyone else has blood still left in them after they have come off that comes out a couple of days later after sex.