I got my perion 2/23/2012 tntil 3/1/2012 nothing abnormal. Then I got my period again on 3/3/2012. This has never happened before, should I be worried and what can cause this? Thank you Sarah

Was the second "period" the same as a normal one or lighter? Are you on any sort of hormonal birth control? That can sometimes cause irregular bleeding or spotting for some women.
It may just be a one off cycle. If you continue to have irregular bleeding, see your doctor for an exam as there can be a number of possible causes.