missed one day and have 3 week period

Hey. So ive been on and off the same birth control for years. I got back on it about six months ago without any problems. At the begining of october i decided to skip my period because it was due to arrive right in the middle of a camping trip, and no one wants that.  All was fine, until i forgot to take it one day. I had light spotting for about a week, and then it got a little heavier. This week is the placebo pills on my pack, and i have my full blown period. Not sure if this is normal, or if i really messed something up.