Hi Sagar, Welcome to HealthcareMagic Forum.
If you have had Unprotected sex recently, you could be pregnant as your symptoms suggest
Pregnancy. Its been one week since you missed your periods and it is the right time to get a Urine Pregnancy Test done using a early morning urine sample. If it turns out negative and you don't get your periods repeat the test again after a week.
Good Luck. If it comes out positive, visit a Gynecologist.