Hi Nitu, Welcome to HealthcareMagic Forum.
You should be waiting for your Next Periods if you have had Unprotected sex between the 10th and 20th day of your cycle. If you happen to miss them, wait for a week to do a Urine Pregnancy
Test using a early morning Urine sample which is the ideal sample and time to check for Pregnancy status.
Good Luck and Take Care.