Hi, i'm almost the 5th month of pregnancy, I am small in size and nobody knows that i'm pregnancy yet. Tummy still quite small. But when should we start to wear maternity underwear or just get a high waist underwear will do? I do not know what type of Maternity clothing should I get too since i'm small in small (before pregnancy = UK size 0 ) wanted to stocks up some clothing but worried that it might be too large for me.