I recently had a cold I'm just starting to get over. When I blow my nose I notice blood in my mucus, should I be worried?

Don't worry try Neti. But do watch for changes. It's probably surface capillaries the have been quite irritated and have broken. It should improve as you recover and you may want to use a neti pot saline wash instead of blowing. If it stays or gets worse - see your doctor. But it should heal up. Best!