Anything I should know about HSG TESTING??

So I’ve been trying to have a baby for the past 3/4 years now..I was seriously on it the past two years and nothing so I gave up , I still just have normal sex with my man...and I always say if it happens it happens so I’m not trying or preventing anymore. So I had a doct apt last week and basically she didn’t know that my ex gave me chlamydia a few years ago tho I got it cleared up , she said your body could do everything it’s suppose to when TTC but if your tubes are blocked ( which happens sometimes with chlamydia ) then sperm can’t get there..so hopefully this works..she said sometimes it says for a HSG test to get done to open them back up. So I have an apt way in June but I’m patient until then I know it’s going to come fast...