HCG X ray???

Cilly✌💚😆
I just had an ectopic pregnancy last Sunday and had surgery to remove the baby and my right tube. My Dr recommended that I have an hcg done to make sure that my left tube wasn't blocked because I had a tubal reversal in June. Anyone that has has one done, how was the experience and was there a certain time in your cycle that you had to have it done? As my Dr said I had be on cycle day 10 and I couldn't have any kind of sexual activity until after I had the procedure done.