HSG test? Increase fertility?

Victoria
I have my HSG test scheduled for this coming Monday 1/4/16 and I'm super nervous about it as I've heard it can be painful. My hubby and I have been TTC for 3 years with no luck 😔 but luckily my blood work and his semen analysis came back fine. Hoping the HSG test can give us some answers. 
I'm curious if anyone experienced fertility after their HSG test? Ive heard it can "clear gunk" out and increase fertility. 
So I'm wondering if anyone who has had this test done got pregnant right away after it
And/or
How painful was it???