In my opinion, you should repeat a pregnancy test after 1 week with a morning urine sample.
Also if possible you can undergo an ultrasound of the whole abdomen as well.
If non-pregnant your doctor may prescribe a form of progesterone to induce periods.
A thyroid function test may be done as well.
As such there can be a variety of causes of missed periods like hormonal imbalance, weight gain, weight loss, PCOD, thyroid dysfunction, pregnancy to name a few.
You should try vitamin C supplement, ginger tea, pineapple, parsley tea, maintain weight, do deep breathing to induce a period.
Let me know if you have any further queries so we can discuss it thoroughly in every aspect.
It’s my pleasure to continue this conversation until you satisfy.
Waiting for your response.