Sex, exhaustion and nausea

So I'm stuck in the first trimester feeling nauseous all day long and absolutely drained. I have a 17 month old that I watch all day and night when I'm not working at my part time job. His father works 3rd shift, 6AM to 6PM so he sleeps all day until he has to get up and get ready for work.

This morning he came home from work, climbed into bed where I was peacefully sleeping after being up and down all night with our teething toddler. And since hes wide awake when he gets home he just wants to talk and spend time together before he goes to bed. Which, on a normal day would be fine because we have to compromise in order to see each other and be able to have some face to face conversation once a day. But today I just did not want to wake up. And then he wanted to have sex and I felt bad because I really haven't been in the mood lately. I'm just too tired and nauseous to be thinking about sex. So I got kinda irritated that he kept trying to wake me up and have sex when I just wanted to sleep while our son was still actually sleeping. And I feel bad that I kind of snapped at him.

Anyone else in the same boat?