Welcome to Healthcare Magic!
Your symptoms are quite suggestive of a pregnancy
but the negative tests 8times are refuting it.
You are having a prolonged amenorrhea
I am very suspicious that you may be having an ectopic pregnancy, say a tubal or rarely an ovarian pregnancy.
It can lead to life threatening complications.
Please get a serum betahCG test which is more specific and an ultrasound
abdomen at the earliest to get more insight into the problem.
I hope the advise would be helpful for you.