My pregnant cat, Bella, has been pregnant for awhile now and today i realized she has chewed off some hair around a couple of nipples, it wasn't like that yesterday, and today she has been a little vocal, and following me around, then she slept for a couple hours, and now she is back to walking all around, and being more vocal than earlier... ONE time she made a kind of howl noise, but only once... Does it sound like she may be close to having her kittens??