pregnancy sex life

well, my sex drive is completely gone. only 5 weeks pregnant, and it's disappeared. I used to have a higher sex drive than my husband...but last night I think I may have fallen asleep during the deed at one point. 😂 he was still able to get off, but I'm just not into it. 😔 this is my 5th pregnancy (will be my 4th living child), and I've never experienced this! any tips? I work full time in construction, and I'm almost 27. not sure if ant of that makes a difference. lol