Could Fever, Outbreak Of Rashes And Severe Pains Be Due To Generic Macrobid?

hi,sunday, almost 2 weeks ago started generic macrobid for uti. thursday started with severe back pain which lasted thru sunday. sunday took last dose, and started with severe leg pain sup to and including tuesday. tuesday developed rash on legs tightness in chest...also sore throat and fever, tested for strep unknown results at this time. placed on amocillin. today, friday, back to doctors....rash still on legs, however hives have developed on arms and shoulders and across top of back. start predisone today, strep results expected tomorrow, still slight fever......could this be delayed reaction to the generic macrobid?