The best thing is to go to the doctors and get it checked. Know that we all go through things like this at one time or another. Dark blood is just a sign of old blood and for some reason, it is not all coming out at once, is what I think. I hope that you feel better and the doctor appointment went well.... the first trip to a GY can be very scary but don't stress over it and understand that all us women go through it. You will be fine.