I havent had my period since december 2010. Since me and my husband is trying to have a baby, every month i am checking whether i am pregnant or not. Did even the urine and blood test too to confirm but every time it is negative. During Jan, i was diagnosed with the e-coli symptoms. I havent got my monthly period on Feb also but i havent taken a test yet. I just want to clarify whether the infections and the medicines could have delayed my period??