Had several times of unprotected sex with bf,never was it painful & there was no bleeding,but the hymen seems to be broken.how?is bleeding common?

Thats possible: Hymen can break after several intercourses. Bleed is common with that. But can't say with any certainity if thats the cause or something like infection is the cause.

No normal: There is no normal as far as what to expect the first time you have sex. The hymen may hurt or bleed when it tears, but not necessarily. It is also possible that you did.have much of a hymeneal ring in the first place. There is much variation, and things such as tampon use or perineal trauma as a child may have caused it to already stretch.