Thanks for writing in.
I read your problem,first of all i would like to tell you that pus from gums indicates infection in that area and only antibiotic will not be the permanent solution of this problem.
So i will suggest you visit a dentist
in your area as soon as possible ans get the thorough examination done and take a proper treatment according to the reason.
If infection is in the tooth there could be two possibilities-
1.If it could be saved-root canal treatment
of the concerned tooth.
2.If it can not be saved-Extraction of the concerned tooth.
If the infection is because of periodontal origin it means there is periodontal abscess
it will be treated b incision and establised drainage
Nothing to get worried.