Grade 2 means Separation and flattening of major folds.
it means that the fallopian tube
is patent and your chances of getting pregnant naturally is good and it is done to rule out blocks in the tube.
grade above 2 may need IVF.
i would advise you to follow up with your doctor and take medications if any prescribed to you and plan your pregnancy
with regular medical follow up.
i hope i answerd your query.