has anyone had heavy spotting

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has anyone had heavy spotting/ bleeding and not had a MC. I found out I'm expecting baby #3 but I have had some spotting. at first it wasn't that bad but the second day I had a couple clots and in the third day just a little pink spotting. this has never happened before so. a little bit scared. the Dr. did some blood work and have to wait 2-3 days and I'm going crazy.