Possibly stress : It is still possible to be pregnant with a delayed ovulation ( late putting an egg out) and have a negative pregnancy test. Any stress either emotional or physical - like significant weight change can also cause a late period. I would suggest having blood done to help diagnose the cause of your late menstrual period- preg test, fsh, lh, TSH and Estradiol initially. Fsh and lh are low if stress.
Answered 6/25/2014
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