Colposcopy

Hi every one..I'm hoping for some advice please....I'm due to have colposcopy 20th Feb (was under impression i was waiting for a ultrasound scan)....now due to pain that I've had for years in the lady area my gp doesn't even use speculum anymore... i went Dr thinking my chocolate cyst may of been back .all symptoms of it..but they not scanned me to rule it out I've had post coital bleeding but it's rare seeing as we don't do it lol tmi? Not had smear,so no abnormal cells been found and blood urine and swab all clear guess I'm just confused as to why this and not ultrasound i was expecting?