I had unprotected sex and after sometime i was also treated for typhoid. would the antibiotics might have also treated any bacterial sti if present?

Maybe not: It depends on the specific STD and the antibiotic administered for the typhoid treatment. If you are unsure about the acquisition of an STD ALWAYS get tested. The ostrich tends to bury its' head in the sand in these matters and when something "bad" occurs tends to "get it" in the place that is "exposed". Se,don't be like the ostrich-get tested.