I used a hairbrush to masterbate today, and when i pulled it out there was a little bit of blood and im a virgin, there was a some discomfort but not alot?

This was likely caused by trauma and should heal quickly and completely. If bleeding persists you should see someone, but I suspect it was a one time thing and that you are more worried than injured

It is dangerous to use such objects. you probably caused some local injury. leave the area alone and let it heal for at least 2 weeks. If not better or any other symptom see your Gyn right away. In future use a clean soft smooth non stiff thing if you have to use anything

You injured yourself by inserting a hard object in your vagina. It will heal if you do not add to the injury. You may wish to explore the internet for information on masturbation by clitoral stimulation. Avoid putting objects in your vagina. Get HPV vaccine. Wish you good health! Safe sex: https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guidelines