thanks for posting your query,
you might be having some infection
start brushing twice daily with mild brush in a circular manner.
use warm saline rinses (half cup Luke warm water + half tbs table salt). rinse with it every day twice after brushing.
some time bleeding is due to vit. C Deficiency, increace intake of citrus fruits and salads .
or take vit c supplements.
bleeding can also b there due to hormonal
visit a dentist
for TEETH cleaning