Hi there, I have understood your concern. I will suggest you the best possible treatment options. 1 ) First of all do not panic. 2 ) It would have been better if you could have mentioned your date of last menses. Anyway, 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 the fertile period, then You stand chance to get pregnant. 3 ) As you had protected sex activity, the chances of getting pregnant are almost nil. 4 ) 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. 5 ) Even if you are pregnant, you can opt for termination of the pregnancy with medicines safely till 9 weeks of pregnancy under medical supervision. 6 ) Before you go ahead in your sexual life, I will suggest you to get proper sex counselling done. Use of suitable contraceptive method like condom, will help you to prevent unwanted pregnancy and STDs. I hope this answer helps you. Thanks. Dr. Purushottam Neurgaonkar.