Can Regestrone Treat Delayed Menstruation?

Hi, i have not been in touch of intercourse since 1yr, but a weeks back we got in touch that is on 23/12/2010,I am protected with copperT and my cycle date is on 5/1/2011. It is been late of 7 days of my cycle.so went to doctor to get a suggestion, she as given me the tablet called Regestrone sandoz 5mg. is this tablet will workout for my problem or anything else to be done.Please suggest me.