Maternity clothes

Chelsie
So, when do you buy maternity clothes? I was in my "fat" regular clothes before I even got pregnant and those still mostly fit, but I don't have a lot of options because I was ( of course) going to lose weight and get back In my normal size.... Now I'm pregnant and just focusing on maintaining/trying not to gain beyond recommendations. Do I buy some extra regular clothes that are a little bigger now or start looking at maternity stuff or hold off until I really start not being able to wear anything? I'm leaning toward buying normal clothes a size up bc I might need those post party too. Advice from moms w prior pregnancies?