cat ??????????

trying to catch everyone up...........
Back in November I posted a picture of my new kittty Bobbi Sue. She is now almost 6 mo. old, born the first week in August.
I think she is looking for a friend (boy). I don't want her to have kittens now....... but later yes. She is VERY upset because I want let her outside. She is all over the house screaming and making threatning noises at me. LOL
I've delt with dogs before and know their is a period they can be put up..........but what about cats??????
Can it happen anytime????? Even if I keep her in the house awhile and then turn her out will she be safe.
Someone told me if she had kittens now that it would stun her growing.
Need some help before I get shredded.
Sweet_Pea