Hi,
There are never clots in stools due to digestion problems,and the clots might be coming from vagina which she might be confusing that blood is coming from her anus.
As clots in stools are also not very common.
I would advice you to go for an ultrasound again for fetal well being,or to confirm it first that blood clots again come from stools if that is so then i would tell you for more tests like stool microscopic examination or more tests might be needed to be done.
Is she having any fever ...
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