Sex feeling like a chore

I get that. I’m sure we have different personalities and histories, but for me, I was straightforward with my husband. As a general rule, we don’t have sex unless it’s an emphatic yes from both of us, but I have such a nonexistent sex drive that we typically don’t. I feel bad for my husband, but we talk about it from time to time, and so far (3 years), he’s still honest with me and completely in touch with how I feel.
Long story short, talk to him. I know some couples go to a “sex schedule” during these down times to keep things alive for them but just communicate

I guess not wanting sex every time he wants it may be a new experience for you, but it's pretty normal in my relationship to say when I'm not in the mood and he has no issue. Try it, he may handle it better than you are imagining....

I can relate. I agree with the ladies above to at least try and tell him. He may respond better than you think. Pregnancy has a massive effect on your body and hormones are so out of whack, so it’s not like it’s the new normal, it’s just the phase of pregnancy you’re in. I feel bad if it goes too long so I will make an effort to have like a long shower or bath to myself before and if I need an extra 20 minutes in bed to myself I’ll just say “hey it’s not you, I’m just overstimulated and need my personal bubble for a few minutes”