If you have antibiotics to hand, please make sure you also have some sterile sample pots.
Always take a specimen BEFORE giving the first of the antibiotics, and take to the doctors' surgery.
That way, if the bug turns out to be resistent, a new antibiotic to which the bug is not resistent can be subsituted.
It can be very hard to culture a bug after even a single dose even of an ineffective AB.