Yes it is normal to have abnormal periods after you stop taking birth control pills. If you had irregular periods before you went on that pill that increases the chances as well. Your body may also be stressed by the changes in your hormone level (less hormones due to stopping the pill) and the loss of weight. Stress or big changes like that can prevent you from getting your period. It is hard to say when you will get your period, though, and it sounds like you really want to start a new pill, but the directions do say to start the sunday after your period. This is because it is trying to get you on a schedule, so you know at the end of the pack of pills, (placebo week) this is when you are going to get your period. If you don't have your period when you start taking the pills, you never know when you will get your period and it may not match up with when the placebo pills (period week) are supposed to be taken. I really think you should wait it out a bit longer, or maybe think about asking your doctor their advice.