I have missed my period for 2weeks now,,and i feel like im pregnant,i have taken HPT but it came negative.I have cramping on my lower stomach most of the time and back pain as well,as period signs,but no period appears.I feel very thrusty though and frequent trip to toilet as well.,and no other pregnancy sigh.is anybody having the same situation like me. Can anybody tell me if im pregnant or not.is it common that hpt fails sometimes? pls help.