Sick and not able to workout 😔😕

I'm almost 13 weeks and am pretty fit in my normal pre-pregnant life, working out 4-5 days a week. And eat healthy. But since getting pregnant, I've been so nauseous and exhausted after work I've not been able to work out. Only walked a few times in the beginning. And I eat whatever sounds good, which is not healthy food. I'm super scared about getting big and not being healthy and not working out and staying strong for birth and baby.