I rec'd my period 4 days early. it's light and light colored. should i be worried or is it because i messed up on my birth control pills this month?

Breakthrough bleed: Breakthrough bleeding (bleeding at the wrong time) is common on birth control. It happens in about 1/3 of users. Its no big deal and usually self corrects over time. It is a common side effect and does not mean something is wrong or that the pill is not working. If you messed up your pills then you are triggering the irregular bleeding.