Buying maternity clothes

Kristi • FTM B\G twins born 2/5/19

I’m plus size and 10 weeks pregnant with twins. I was wondering when other plus size mom’s of twins bought their first maternity clothes. I haven’t gained any weight but I’m up a size or two. Luckily I have some clothes that were too big that I’ve been wearing. Some of it I feel is only going to fit for a few more weeks.