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Yes, there is some chance of pregnancy. You can use condom, but there is no contraception 100% effective even after contraception-operation very small chance of pregnancy remains. You can bleed any day after taking I-pill. There is no fixed rule it may take even 10 days and bleeding usually will be normal not painful. When bleeding occurs after stopping pill, it is called withdrawal bleeding. Withdrawal bleeding rules out pregnancy. However, your next period may come early or late, so take precaution with adequate contraception. Contraceptive pills can change your bleeding amount and cycle for one or two months. It will be effective only after sex pill, not before sex. But, as mentioned above there is no 100 % effective method.