Hi Lizzie, I'm sorry, your question may have got missed because it was posted on this thread. Never mind.
The blood clot MAY be nothng to worry about, but dogs can have spontaneous abortions. There are a number of causes, from fungal infections, to hormonal imbalance. Usually there is more bleeding, and sometimes an expelled fetus can be seen.
I think however, that the best idea would be to take her to the vet for a thorough check. The vet may want to do an ultrasound.
hii my dogs 2 and a half weeks pregnant and has lost a tiny blood clot is she having a misscarege
What an amazing thing! It's a miracle, must have made that family very happy!
What a tough little dog!