Can any one help?

Hi every one,my rabbit that I recently rescued (29 days pregnant) keeps chewing on hay or thicker bits of hay but not nesting as yet, she carries it round for ages and also keeps sucking on it, I am sure if its either effected her teeth or mouth as she has not been able to chew her pellets or eat them properly.

is this normal or is it due to her being pregnant?

Can any one shed some light? Thanks guys

PS:Just checked her now, bless her she is carrying hay like there is no tomorrow to her box