Your burning with urination and vaginal pain in pregnancy usually points to a urinary tract infection. You'll need a fresh test to guide treatment, rather than repeating last month's course on your own.
Next Steps
Please see your obstetrician for a urine culture before taking any antibiotic again, since the right course depends on your current infection.
Health Tips
Untreated UTIs in pregnancy need prompt treatment, so don't wait too long to get this checked and confirmed.