After my boyfriend fingers me or even when we have sex, i start to bleed. it usually starts in the middle of it and doesn't last long. ?

Infection or trauma: Vaginally bleeding after sexual intercourse is obviously not normal. This would suggest trauma or some type of infection. Suggest getting evaluated by your healthcare professional.

**Must see Gyn: Cervical and endometrial causes. Cervical: Cervicitis from infection(from STD) or irritation from tampon, Cervical pre-cancerous cells or cancer, Cervical ectopi, Cervical polyps, Endometrial infection(from STD), Fragile unstable endometrium(having sex during ovulation or just prior to period, being on BCP), Endometrial polyps. SEE: http://bit.ly/1y7Ckai **Must see gynecologist.