I was given a shot of rocephine yesterday, approximately 20 hours ago for gonorrhea. In the past I have had mild allergic reactions to antibiotics which mostly included breaking out in hives all over my body. I am just a little worried.....is it too late for the reaction to occur? Would it have occurred already since it has almost been 24 hours? Also, if I was to have any other side effects, when would they show up? I am just wondering because I am not familiar with antibiotics at all and I am a little concerned. Thanks