After giving birth I have pain during intercourse, had first degree tear during birth?

Hi I gave birth 8 months ago and I have since had pain during intercourse. The pain is felt deep inside not where I would have any scar tissue and I also get a tightening/cramping sensation that is painful on occasion in and around the vagina after sex.
I had a first degree tear with no stitches required and I am a first time mum with no complications during birth and a normal vaginal delivery.
I am in a long term relationship and we are both clear of any STIs.