I have been taking a contraceptive pill for nearly 2 years but for the first time ever i got my period while in them middle of the pill packet.advice?

Maybe: I don't have specialty training on the question you asked, but by my general medical knowledge, some sudden changes in your life, extreme high/low emotion, etc may change your onset of period. Askin your pcp to rule out those possibilities will be the best to you.

Breakthrough bleed: Breakthrough bleeding (bleeding at the wrong time) is very common on birth control. It happens in about 1/3 of users. Its no big deal and usually self corrects over time. If you are not satisfied or it continues to happen then consider using a different birth control method. It is a common side effect and does not mean something is wrong or that the pill is not working.