Is my cat pregnant is this normal?

hi i have a cat name ameria she is 1 year and 4 months old she snuck outside august 17th and came back at 11 pm and she mated with a black and white stray cat well i think its been showing up but a week ago she was with my grandmas healthy cat and they mated 2 times we couldnt catch her for 3 hours and he showed up at our house at 2 am that night than last night the black and white cat was at my house at 10 pm than my grandmas cat ( tabby) came at 11 pm last night but ameria didnt seem rally to care that much i think she is pregnant because... i think her heat cycle stopped today because she is way more quiet and she eats WAY more and her are a light pink and they grew a TINY bit i googled pics of non pregnant cat and her are more pink than them and she sleeps WAY more and her stomach seems firm it doesnt seem that squishy but i dont know if that would matter today is the 21rst day from august 17th and she could be pregnant if she is with my grandmas cat and the stray and she seems like she is kinda nesting because she loves boxes now lol! and she is way ore affectionet and she is urinating way more and she is scratchibg like everything and she is vomiting! she threw up about three times today it wasent a hairball she didnt eat gr all it was was cat food is that normal get a pregnant woman has morning sickness? i need help is that normal because every1 on her is saying congrats ur cat is pregnant? is this vomiting normal and do U think she is pregnant plz i need alot of answers thanks !