Hi there, I have understood your concern. I will suggest you the best possible treatment options.
1 ) First of all do not panic.
2 ) As you might be aware that in a woman with regular cycles day 10 to 20 of the cycle is the most fertile period of cycle. If you happen to have unprotected sex act in this period, then You Stand chance to get pregnant.
As per your history, you had unprotected sex in the days prior to your expected date of the cycle. Also your urine
pregnancy tests are negative.
With this back ground, you can assume that you are not pregnant.
In case of doubt, blood
beta HCG test and USG will be of help.
3 ) Your delay in getting the periods can be due to some
hormonal changes or
stress of illness on your body.
You can simply wait for the onset of periods or induce the periods with
progesterone tablets. Your treating doctor can guide you further about the prescription doses and withdrawal bleeding of the same.
I hope this answer helps you.
Thanks .
Dr. Purushottam Neurgaonkar.