Bleeding due to contraceptive effect

I have been bleeding for 20 days, similar to "coffee grounds", it seems menstruation in the last days. Being that this is bothering me VERY much, besides, I had relationship with my boyfriend twice and bled in both, the gynecologist said that as the vagina is very vascularized, the tendency is the bleeding increases with the penetration, and the reason why I'm bleeding was the contraceptive contraceptive. I wanted something to stop this bleeding, because it's so annoying, nobody deserves to spend the whole month bleeding. The doctor said that if this had really bothered me, I'd take a hormonal contraceptive, but she did not recommend it.