Place a napkin against her vulva. Do you see blood? She could be going into heat but not actually in heat. You could ask her previous owner if they observed anything as it is possible she is going out of heat...meaning no more blood show.
Her nipples will never be flat against her chest as they remain in spayed females.
If she is pregnant...it is far too early for your vet to tell. A relaxin test can't be done before day 22. This is essentially a pregnancy test. Pups cant be felt by palliation until around day 30 and the same with an ultrasound..
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