Hi sweetie :wave: sorry you've been having a tough time.
I have had the HSG and it honestly wasn't as bad as I thought it was going to be. Take the strongest pain killer and anti inflammatory you have about an hour before the procedure, that helps.
For me, it just felt a little uncomfortable and tighter inside, a bit like period cramps. My legs went a little achy at the thighs and my back, but I usually get that with bad AF pains.
I took a couple of days off work to rest and not lift things and it really wasn't as bad as I had expected.
I wish I could tell you that it helped with our bfp but I don't think it did, since it was about a year before we conceived.
What it did do, was help me to tick something off the list and be more positive about ttc. If there are no blockages then that's great, if there are, then at least you can know what is next.
I have heard of lots of ladies getting their bfp as the dye flushes out the cobwebs!

others get their bfp because just doing something towards ttc helps to relieve their stress xx
Hope it all goes well, please don't worry. It might be a bit uncomfortable but it's not that bad and is over pretty quickly xx