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You need to wait for your period which should be on September 4th probably. If the period is delayed by more than 10 days from this, then there is chance of pregnancy
. Do a Pregnancy test 7 days after sex to find out if you are pregnanct. If periods are delayed and pregnancy test is negative, possibility of hormonal
disturbance is there. Now there is no contraceptive
effective. You need to take Emergency contraceptive 72 hours after unprotected sex to prevent chance of unwanted pregnancy. Consult your Doctor on this and follow up. Use condom to prevent unwanted pregnancy and STDs.