Maternity clothes/baby bump

Babysushi

Hi Im 8w3d and it's my first baby, I'm wondering when usually is best to buy maternity clothing. I really have no bump yet coz I'm pretty tiny. In my 4th week gained 4 lbs that got me excited but now I lost 6lbs due to no appetite and awful nausea. Im supposedly 8wks and no bump at all! I'm a tad bit concerned but at the same time I wanna be prepared for when I start getting that cute baby bump which I am so excited for! Ive been looking at maternity online and I really wanna get those maternity pants coz they are on sale and look absolutely fabulous!