What can I do if my hCG level is 4725! and im only 4wks, does that mean I could be having twins?

No. The only thing about an HCG level is that the absolute number isn't the most important thing. Usually the lab is repeated after 48 hours at least once to determine if the level is increasing appropriately. It should double every 48 hours but can still be normal is it goes up less than that.