Help! Maternity / nursing bras

Size 34B pre pregnancy. So I ordered a M per the chart below.

I’m on the fence — on the one hand, I’m on the last hook on the band ... but the cups seem too big. Can’t decide what to do. I’m ~23 weeks and dk if my boobs will go up a cup or not. Since the band is such a snug fit, I’m not sure if I should order a size S. Any suggestions ladies?