How do you tell the difference?

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How do you ladies tell the difference between clots and discharge when you are bleeding? I'm 7.5 weeks and have been having spotting since March 30th. It's gotten heavier and is almost black and I can't tell if I am seeing clots or discharge colored by the blood... I have a photo but will spare you all. Hubs wants to go to the ER but I'm not sure...