Im embarrassed but i masterbated using a hair brush today and noticed some bleeding afterwards. i used the handle. i am sexually active. could this have caused a cut or injury? will it heal on its own? should i wait a few days before going to doc?

It will heal, give it a few days. If you still have bleeding/spotting a week from now, it would be prudent to see a doctor. You may wish to look into clitoral stimulation for masturbation rather than inserting stuff into your vagina. Get HPV vaccine. Wish you good health!

If you want to be sure about the health of your vagina please see a Gynecologist who can do a through examination.