Pregnancy and postpartum Bras

Ma

I am about 5.5 months pregnant. I’m on the smaller side with regards to overall pregnancy related growth so far. I know I will at some point need new sports bras/nursing bras/support bras. I’m just not sure when to buy this, how many of each to get, good brands? The Bra front is confusing to me. I want to be strategic! Help!