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Short answer; there is always a chance of pregnancy when you have sex, always! The pill is not 100% effective, especially when you miss pills or don't take it at the same time every day. Unfortunately nobody can tell you the chances of you being pregnant because there are so many variables it would be near impossible to give an accurate number (everyone is different, it depends on your physiology and the physiology of your boyfriend as well as many other things).
So, you had sex the chance is there, you made some mistakes with your pill which increases the chance. If you miss your period and you're worried take a test, however remember that restarting the pill can make your period abnormal for a bit, as well as the stress of thinking you may be pregnant. Try to relax and hope for the best.