DYRADE M is antibiotic. Blocked tubes can result from genital infections so it might help in it but the infections which cause blockage of tubes are not covered by this antibiotic. Still your doctor has prescribed you antibiotic because HSG is a procedure which has to be followed by a week course of antibiotics.
I would suggest you get an ultrasound
too , to rule any mass lesions. Besides get a tuberculosis
work up done which is the most common cause of blocked tubes.
Since you have conceived once , its unlikely that your tube is totally blocked. i suggest you shoud get a diagnostic laparoscopy
with chromopertubation to confirm your diagnosis of blocked tubes.
You are just 26yrs and you can still wait for a spontaneous pregnancy
to happen again. I suggest you start folic acid
tabs and try for pregnancy. Folic acid avoids miscarriages due many causes. If you dont conceive in the coming three months , you should get yourself investigated.