Thanks for writing to DoctorSpring.com with your health concern.
With 3 negative pregnancy tests, you are definitely not pregnant.
And the answer for such a long menstrual delay lies in your question. Obesity, stress, tensions - these are the leading causes of menstrual delay.
You have always had a history of irregular cycles, so please get investigated for the same. I think the diagnosis in your case would be PCOS - polycystic ovarian syndrome. Herein there is baseline hormonal imbalance, so ovulation and menstruation are erratic. Please visit a gynaecologist for a formal internal evaluation - per vaginum and per speculum.
Also a pelvic ultrasound scan.
Please get blood work done = FSH, LH, TSH, Prolactin, OGTT, DHEAS, Free testosterone.
This would reveal the diagnosis.
Cyclical oral contraceptive pills would regulate your periods.
Losing weight will go a long way towards improving the symptoms.
All the best.
Take care, and please feel free to discuss further.
Patient replied :
Thank you doctor for your help! It did help me to distress knowing I am definitely not pregnant! Just a follow up question. Is it a good sign that I am ovulating and have minor cramps? Does this mean I have a good chance of getting my period this month?
The signs are not definite in anyway.
Having four months of amenorrhoea is reason enough to have a formal workup as outlined by me earlier, since there is definitely some underlying pathology.
I would advise you to go to the gynecologist either way and get yourself examined.
I hope this helps.
All the best.