Thanks for all these additional information.
I understand your concern.
Well as you describe, with a history of unprotected sex and previous regular periods, there is a chance of pregnancy.
And as you had last period on 10th March, then you should wait for a week after 10th and if you wouldn't get your period then a urine pregnancy test with morning urine sample should be done to rule out pregnancy at the first place.
Still, there is only 25 % chance of getting pregnant in one menstrual cycle.
So, if your urine pregnancy test after a week would be negative then there can be a variety of causes of a missed period like hormonal imbalance, weight changes, PCOD, thyroid dysfunction.
Now, as you have cramps so you can safely take OTC Liquid Emetrol, Tylenol, and Mylanta Gas, Metamucil.
Maintain a good hydration with Gatorade.
Then 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.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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