The only maternity wear I’ve bought was two pairs of jeans. The rest was all what I already had. I also bought some cardigans because they don’t need to close but keep you warm anyway.
Plus: maternitywear these days is very cute and superexpensive - you won’t be walking around in tent-like dresses in garish prints, Elsie. You’ll be fine. Plus I think in your case it would be nice to splurge on it - things are difficult enough as it is.