Back pain and bleeding?

Hi all! 

So a couple months ago my second smear came back abnormal, I went to colposcopy and had a lletz done, confirmed cin3, referred back for smear in 6 months. I've felt fine since except for about a week, I've been suffering bad back pain, I've took pills and used heat pads but it just doesn't go away, put off getting it checked because it seems trivial but for the past few days I've also been spotting, this for me is unusual because I've never bled between periods before. Has anyone ever experienced this?