I used to call this the dildo cam! When I was going through my fertility treatments, I'd have one of these internal ultrasounds everyday for two weeks straight to check follicle growth. Did that for 8 months, loads of fun! Some days it was more uncomfortable than others, especially just before I ovulated but I was also on mega fertility drugs and would produce 10-15 follicles on average per month.
Like the above posted said, if sex is painful you might find this to be as well but mostly, its just sort of embarrassing.
-------------------- Taking it one day at a time.....