regression

I'm currently 30 weeks pregnant, and my 3YO has seemed to regress. We are doing toilet training now and I'm so afraid that she is going to regress back to diapers when the new baby is here... her current regression includes asking to drink from the milk bottle (we have quit it alr), asking to drink from my boobs?! (even though she wasn't breastfed past 1 month old), and asking to be carried all the time. and she's always saying that she wanna stay small and be a baby. will it get better or worse when the baby is here?