I am 8w 4d pregnant & I have been having back ache near my spine on the left side for a couple of days now. I urinate so frequently. And sometimes I feel like I need to pee while i'm about to finish peeing. No fever, no burning sensation & no itchiness in my private areas. I called my obgyn office today & they told me to go to the er. The er doctor did a urine test & ultrasound (normal result). But urine has wbc & no bacteria. Doc told I am uti symptomatic & the nurse just gave keflex (cephalexin) which I took 500 mcg (i regret it later). Is cephalexin safe during pregnancy? Some small studies have shown cardiovascular & neurological disorders in newborns. I am worried & having second thoughts whether to continue or taper off the dosage after consulting my obygn. The doctors who saw me - one is an intern & another is an internist in er medicine.