Hi Elle,
There is a chance you could get pregnant ( very low risk, but it's still there). The pill needs 7 days to switch "on" and "off". Since you've had a break of more than 7 days, there is a very slight chance of ovulation occuring. You can still get the morning after pill if you hurry. Most effective less than 72hrs after intercourse. Go see your pharmacist asap and do a preg test in 2 weeks. Goodluck hun.