Aaaah! You were on the Pill. If you've just come off the Pill then you periods will be a bit screwy until your body settles down; this is normal.

Some people have to wait up to 3 months for a post-pill period (I think up to a year in very few cases) although they mostly settle down before that. It's because your body has to get used to regulating hormones again.

Hope your period returns to normal soon, although it may be another month now.