Hello, it seems to me you may have an infection in your gums. It is all too common among females and there is no need to worry. You just have to resolve the infection.
Next Steps
Buy a gum astringent from your nearest pharmacy. commonly available as gum paint and apply it to your gums after you brush. Keep it for 5 mins and rinse. Do it twice daily
It would help to undergo scaling or tooth cleaning from a nearby dentist to remove all traces of infection as the gum paint merely stops bleeding alone.
Health Tips
It would be optimal to resolve the infection immediately as prolonging it can result in loss of support for your teeth and progressively tooth loosening.