If your body naturally blocks a fallopian tube and a hsg proves nothing is getting through, can it naturally unblock itself?

Rarely. : The HSG procedure can in some cases open one or both Fallopian tubes. This is a temporary effect. Also a small catheter and guidewire can be used to clear out the Fallopian tubes. This can be arranged through an Interventional Radiologist or a Fertility Gyn. The test will be scheduled according to your cycle and you will get antibiotics. Check out sirweb.org for procedure info and Dr finder.