My period was suppose to come on 9/12/2015, I am 9 days late. My periods has been on a 27/28 day cycle. I have taken multiple HPT, 2 PT at the doctors and a blood test that was negative. My doctor just ordered more lab work to be done and a ultrasound. I been tired and very emotionally lately with mild cramps. I had a bilghted ovum back in April of this year. I had the same symptoms as well. My periods has been on a 27/28 day cycle. I am nervous and scared, I and my husband been trying to conceive. I want to know what is wrong and why?