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Hello, My name is Terri.It is my pleasure to assist you today!I am reviewing your question right now and will reply in a few minutes.
How long ago was Holly outside and possibly mated?
Do her nipples look like this?
Cats are pregnant + or - 63 days so Holly's nipples would be like the examples now.
She would also be nesting (looking for a place to give birth)
The vet could measure the hormones in her blood similar to a human pregnancy test.
What to expect week by week:
I hope this helps to determine Holly's situation.