I wear skinny jeans all the time I'm 25 weeks and I just keep it unbuttoned with one of those pregnancy bands over it it's made to cover the unbuttoned part you can get it at target for cheap! Yes skinny jeans can harm the baby. My Dr told me that so as the baby gets bigger just don't button them.
I use a hair rubber band and I only wear skinny jeans.
Stick it through the hole, loop one side through the other and put it around the button. Hope that makes sense lol And you wont squish the baby ahaha
But maternity stores do sell little elastic button extenders to make your pants work longer so you don't have to deal with a saggy but from going up a size
You're fine, it won't squash the baby lop