Hello I have a headaches which I have been having for weeks, lower back pain, lower abdominal pain that comes and goes now butn it was constant a few weeks ago, feeling of nausea, sleepy all time, my menstrual just started the 26th and it s gone now I too pregnancy tests but they all came out negative blood and all. I had the same problem with my son didn t get a ppositive test until I was three months pregnant could this be the case here?