Sometimes, certain birth controls can have this effect (whether it is supposed to happen or not). Other than that, there really isn't a safe way to do so.
If you have excessive menstruation you should talk to your doctor. Some women are able to short their cycle with running. Another common method, no always safe, is the pill.
The only real way to do it is with a birth control pill. Your doctor can help choose which one is right for you. It should shorten/regularise your period.
