Hi!
The first thing I almost always check is a pregnancy test. If that is positive then of course we would go down the path of ruling out ectopic or miscarriage.
If negative, it's a different story. I usually like to do a complete exam and pap smear and probably an ultrasound. Sometimes prolonged bleeding can be a sign of a build up in the uterine lining that needs to be cleaned out. Most of the time this can be accomplished with progesterone.
You should definitely get a check up.
Good luck!
Dr B