IS MY CAT PREGNANT!!!!!!!!!!!!!!!!!?

hi my cat snuck outside on august 17th and came back the same day at 11:00 pm i think she is pregnant and i am going to tell u y. first of all when she came back my dog was sniffing her like crazy he never sniffed her like that even when she went into the woods but i caught her! she is more quiet and lazy and more lovable than she was when she was in heat. her food appitite has increased by a little bit not alot yet. she has mood swings? wait do cats get mood swings when they r pregnant? because she is nice then 5 secs later she is mean! she is 1 year and 2 months and her b-day is in may on labor day september 7th i will check her that is 21 days after the 17th. is she pregnant do u think she is she has been laying on towels alot and hiding whenever i set down a towel she runs 2 it and there bis a toy she has and she puts it in her mouth and brings it to the closet and licks it on the towel i have in there and if we try to take it away she attacks us! and i had cushions set up and she went under them and layed down and i said hi baby and put my face inside and she meowed ran to my face and attacked me! then i was screaming owwww and she came up and rubbed against me more mood swings and she puked something up small sqishy and black! plz answer asap thanks!