I did ...if your tubes are blocked - it can be very painful but not too bad more just as they do it - [paracetamol is pointles in my opinion] as they inflate your fallopian tubes instead of it draining - .The DR did it twice to me (few minutes apart -said it might unblock) and you only leak a little so panty liner is good idea or slim pad.
if not blocked the fluid drains out and not painful but uncomfortable like a pap smear with speculum etc and small catheter they insert through cervix.