Cats nipples are pinkish, but small, and she is scared and skittish - Pregnant??

Hi - I think my cat might be 3 weeks pregnant. Her nipples changed to pink a could of days ago, but very small still. She is not at all more affectionate, and more irritable and scared of regular things. She doesn't want to be petted either - she will tolerate a bit. I keep reading that pregnant cats get more friendly. Note: She was a stray we took in, but had a color (no id) and had dental work done, so had been taken care of in the past. Ant thoughts? Could she just be hormonal?

Most likely pregnant. Nipples do pink up around day 21. Tummies begin to show around the fifth week. You'll know more soon! [emoji]128522[/emoji]