It sounds as if she is expecting kittens and also has tape worms. She needs to be seen by a vet,
(a) to determine whether she is pregnant
(b) to get some proper advice about worming. She will pass the worms on to her kittens (if she is pregant) and they will need to be wormed at very regular intervals.
If you can't afford a vet, phone your local area Cats Protection League and ask their advice, sooner rther than later.
PS A bad case of worms will make a cat's tum look very pregnant!
Hope all goes well.