Vaginal bleeding between periods...

Mrs L

So...when I was pregnant in 2016 my midwife asked when I last had a smear test...it was over due at that point so she made a note for me to have one after the birth. Anyway, I haven't had one yet and two things have brought it to my attention recently, cervical cancer prevention week in the uk and this problem....for a good few months now iv been having some strange bleeding between periods. It's mainly after sex and (what I just realised today) after BM. Anyone have any insight?