My last period was on 20/6 i had unprotected sex on 9/7 my periods has not yet come. i am feared of pregnancy what should i do? my cycle would generally be 28-30 days?

You had unprotected sex in the ovulation window so pregnancy can't be ruled out but it's too soon for a urine pregnancy test. By Sunday, if period has not come, an early morning urine pregnancy test should be done. If the test is positive, you can make decision then. From now on, if you do not want to get pregnant, please practice safe sex or at least use contraceptive method(s).