I have missed my period for 4months now on Wednesday and date of LMP was January 14,2015 . I have numerous blood tests and pregnancy tests done, negative, negative, negative for diabetes and std s as well. I have had numerous side symptoms, nausea in the beginning cramping but no period, I have had really strong lower back pain, as well as thumping in my stomache that goes away within like 5 minutes or when someone else tries to feel.