Thanks for all these additional information.
I understand your concern.
Well as you describe, chances of pregnancy with a negative urine pregnancy test a week after the missed period are less.
Still, I would recommend undergoing repeat urine home pregnancy test with a morning urine sample for a precautionary measure in the next few days.
As such there can be a variety of causes of a missed period like hormonal imbalance, PCOD, thyroid dysfunction.
So, you should consult your gynecologist and your doctor may advise some form of progesterone to induce a period and further investigations like ultrasound, blood work like Thyroid function test, LH, FSH etc may be advised for further diagnosis and management.
Now, you can take OTC Zantac for nausea and heartburn.
Hydrate yourself with Gatorade.
Eat a bland diet.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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