I had DS1 in 2012 by CS - I got to 5 cm dilated before they discovered he was footling breech. Afterwards, sex was painful for about 6 months and I had discomfort inserting tampons, and they had a tendency to "fold" on themselves during insertion. It gradually got better, which seemed to coincide with me stopping BF.
I've since had another pregnancy which ended with me losing the baby at 21 weeks. This was 7 weeks ago. I had a missed miscarriage and was induced, and delivered vaginally. No tears or stitches, he was tiny, he only measured 16 weeks. 
My period has now arrived, and I'm having real issues with tampons. Inserting them is uncomfortable, it feels as if there is resistance. Once they are in I can feel them and they keep sliding downwards so they are partly poking out. (Sorry if TMI).
Can this be normal? I've now got it into my head that maybe I have actually cervical cancer and that's why I lost the baby (possibly ridiculous but these things do play on your mind, I seem to have spent the last 7 weeks looking for a reason
). I will go see the GP, and I'm due a smear test anyway (letter arrived last week), but has anyone else got experience of issues with tampons after birth?