do i have a right to be upset

first let me say my fiance and I have 3 kids one is mine(1) one is his (9)and we have one of our own (8 months) I'm a stay at home mother and he works at a elementary school as a janitor from 2pm to 10pm. Ok here is the question. last week my fiance was sick so all day long I took care of the kids (he normally does nights with them) while let him rest. but here I am sick and so are 2 of the other kids and when he was sick I asked him what happens when I get sick you aren't going to help me in the morning and take care of the kids so I can rest his response was I work and you don't. I found this beyond unfair I understand he works but he doesn't go in until 2 and gets home by 10. thats not my fault he stays up until 5am on his ps4