Well if you are having irregular bleeding p/v and also post coital bleeding per vaginum at this age of 42, you need little further evaluatuion. You have to visit to a gynecologist, for a clinical examination and particularly the examination of the cervix
.You may need to perform a diagnostic hysteroscopy
with endometrial biopsy
or simply a D& C with endometrial biopsy. A ultrasonography
is a another optional investigation you may need to do if your gynecologist desires.
Good luck ,bye