This is ok that you start trying to conceive while you are having this antibiotic for the infection.
The group of antibiotic with which this belongs to are considerd safe in pregnancy
and at this time you are not pregnant. It also depends on the severity of infection you are suffering from that what abtibiotic and for how much duration you have to take. If the infection is severe and long duration of antibiotic therpay is required than I would suggest that you should better finish with your antibiotic course and treated with the infection and than try for conceiving.
Thanks and take care