There's little blood when I blew my nose. And now I feel like my nose is "heavy". Help? What should I do?

Bloody mucus. This is common. 80% of people experience nosebleeds in their lives. A common cause is dry, hot air like inside the home in the winter causing nasal dryness and crusting. The nasal tissue cracks and bleeds easily. Treatment includes humidifiers and nasal moisturizing with a variety of OTC nasal saline gels or mist sprays. It's not a major health hazard, but should see MD to check if persistent.