Pregnant and I have a low BMI?

I’m still really early only like 2 weeks? I just found out yesterday so on Monday they will confirm how far I am. I’m tiny only 4’9 but I’m 80 pounds. I’m eating as much as I can but i have morning sickness and I get nauseous. I’m a little concerned about my weight and if that’s risky for pregnancy? I’ve been tiny my whole life even before I got pregnant it’s hard for me to put on weight