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 there is history of unprotected sex act, right on the day of ovulation, then you have chance of getting pregnant.
3 ) But within 3 days it is just not possible to get symptoms of
pregnancy.
4 ) If possible, you can take
emergency contraceptive pill within 24 to 72 hours of unprotected sex act, it works to prevent the pregnancy in more than 95 % cases.
5 ) If this is not possible now, I will suggest you to wait till the expected date of the cycle. If you happen to cross your dates, then please get morning's first sample of urine tested for pregnancy. In case of doubt blood
beta HCG test and USG will be of help.
6 ) Even if you are pregnant, you can opt for termination of the pregnancy with medicines safely till 9 weeks of pregnancy under medical supervision.
I hope this answer helps you.
Thanks.
Dr. Purushottam Neurgaonkar.