I had a miscarriage at 14 weeks it's 4 weeks later and there is still blood clots falling out should i be concerned?

Maybe: First - I am so sorry for your loss. I am sure that must have been hard for you to go through. Regarding your bleeding, it depends a little bit on whether you had a D&C or not. 4 weeks is kind of a long time to still be bleeding, especially if you had a D&C. If you passed the pregnancy spontaneously, you may still have some retained pregnancy tissue. See a doctor to have an ultrasound.