The list of: Possible explanations exceeds the 400 characters of space i have. Do you have 28 day cycles? Are you not pregnant because you had a negative test or because of no activity in the last month? If the latter, maybe you were pregnant when you had your last "period". Pregnancy has to be excluded first. Then your doctor can look at other possible causes. I hope you get it figured out. Good luck!
Answered 5/24/2013
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