My girlfriend was on 9th day of her menstrual cycle and that was when we had unprotected sex. She took an i-pill within 2 hours of unprotected sex. 4 days later she got her periods again on 28th oct. Does that mean she is not going to be pregnant? Currently it's been one month, she has not received her period yet but does feel mood swings, and all the effects of when a period is nearing. Should we still be concerned if we already know that she got her period 4 days after taking the i-pill?