Feeling completely useless :(

Hi guys

I'm in my first tri, 6 weeks and I have a very demanding job (non profit management, mental health feild). I'm feeling really guilty because I can't perform at work like I usually do. Feeling sick, unfocused and exaughsted often. Today I said I was going to try and work from home but got very little done, I slept most of the afternoon. I feel like I've always been a high achiever that can push myself to get things done and it's really upsetting that I just can't right now.

Anyone else feeling like this or can relate? Any suggestions on how to deal?

Thank you!