advice

I have dark blood clots and slimy dark mucus when wiping. also have been getting pelvic pains and cramping these last few week. called my dr and he's like it's nothing to worry about your not pg cuz you got your period 2 weeks ago, can't be a miscarriage. asked if I could come in to do a ultra sound thinking maybe I have a sist or a tumor causing this and he just blew me off and said we will wait and see when you come In for a pelvic exam. Needless to say I can't get in for 3 weeks. should I just find a new dr? anyone else have these syptoms and know what may be causing this unusual bleeding and pain?