Stray got in

Hey a stray got in my apartment some time this evening. I just noticed a few minutes ago. She is a beautiful tortie that I have fed from time to time. Any way I was letting her eat then I was going to put her back outside. While I was petting her I felt under her belly and you can feel her teets I counted 5 that were raised but not milk filled. Could she be pregnant? 

Next while she was eatting she was cool with the other cats until Lil Bit hissed at her. After that she hissed and ran upstairs now I dont know where is went, so many hiding places there. How do I get her out and back outside? 

If she is pregnant should I keep her in? Is there a way to tell? 

Here are some articles you may find informative.

Cat Pregnancy  - How to Tell if My Cat is Pregnant?  - 

Pregnant Cat? What to Prepare For the Birth  - 

Help! My Cat is Having Kittens!  - 

Post-Birth Complications in Cats  - 

How Do I Know When My Cat Will Give Birth?

If she is far along in pregnancy, you will be able to tell from the signs given above.  It sounds like she is.  You should definitely keep her inside until you know for sure.  Outside is no place to have kittens.  Also, if kittens are raised being handled by humans every day, they will grow up to be socialized and adoptable.  If they are hidden away somewhere outside and dont meet humans until they are over 6 weeks old, they don't usually do as well.  It's important to start that bonding as soon as they are born.  Since you have been feeding mama, she is probably dependent on you and might like to stay inside especially if she senses babies will be coming soon, and it will be cold unless you live in the southern hemisphere.  Ideally you should give her a room of her own, or a least free of other cats, OK to share with human, and put her food water & litter in that room.

If you can possibly get her checked by a vet, that would be the best option.  You could have her tested for aids and leukemia (if she is negative then her kittens will be negative, a good thing to know when it comes time to adopt them out to new homes.  Having her private room is important, and if not a whole room, sometimes they can be happy with a large dog crate draped in a quilt, to make a cave-like setting for them.

Let us know when you find out for sure.  We'll be glad to go through it all with you and answer any questions we can along the way.