Spotting 2 days befor af tmi

Xochitl • In love and miss my babies 12/07/13 01/03/15
Yesterday my dh and I were having anal sex and when we were done I went to the restroom and whiped and saw pink my cervix was low and firm already and it went back up. I went to check today and ther was nothing any more can sombody tell me why?