HSG test?!

Mrs.R • Married on 10.24.15. TTC since 01/16
I am supposed to schedule an appt. for my HSG test this week after I start my period to  check for tubal blockages. Has anyone had this done? What was your experience? Painful? Any advice? My husband and I have been TTC 13 months and all other testing has checked out with good results thus far so this is our next step!