What does the pain feel like

I have been referred to hospital for an ultrasound.   Been through menopause for over a year but I have been spotting and have had dull pain since last saturday.   Also had a cervical smear in aug that was not 100% okay but was told they would retest in a year as I had no other symptoms.   I am hoping all is okay.  I was wondering if anyone that has gone through this could explain the pain they had...trying to decide whether I need to worry or not!