You can bathe your girl up until she is about to give birth... it's nice for them to be clean right before giving birth... I usually give the last bath a few days before they are due. I wait at least a week afterwards to bathe them again.
I stop all flea meds when I think my girls are pregnant... some vets say it is OK to use certain flea meds...
I just don't put it on them .
I also restrict exposure to my other dogs the last two weeks of their pregnancy... not everyone does this... I put them in an xpen.
All the best to you. Keep us posted.