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The symptoms you have described of having missed your menstural cycle this month & had a negative pregnancy test,the symptoms of sharp pains in left side of abdomen can be due to ectopic pregnancy where an embryo implants outside the uterus.
Other possible causes are:stress,being overweight or underweight,imbalance of hormones,polycystic ovarian syndrome/estrogen dominance,uterine abnormalities (fibroids/cysts/polyps/endometriosis).
You need clinical examination,testing for thyroid function and other hormone levels. A pelvic exam is required to rule out any uterine abnormality, a cervical polyp or fibroid, or a uterine infection.Also you need an ultrasound to evaluate the uterus, the ovaries and the fallopian tubes.
So I advice you to consult your gynecologist for the clinical examination to find out the root cause & then take the treatment accordingly.
Hope this helped.
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