9 day period!! Should I be worried?

Ok so I need some advice. I was previously on bc for a year and all ways skipped my sugar pills. Well I came off of my pills for about a month had my first period on May 6 which lasted about 6 days. Had a obgyn app. On July 1st everything was fine. My ob put me back on the pill because I have decided I don't want anymore kids. Well on the 7th I got my period. I'm still on it and it's been 9 days already. So I be concerned about this? I called my obgyn and waiting for someone to call me back.