Declined sex drive 27 weeks pregnant

So since I've been pregnant my sex drive has significantly declined. My husband gets mad at me and says I just don't love him and don't want to be with him. This is my 3rd pregnancy but first with him the father of my older children was not there through the pregnancy so sex was never an issue. My husband swears every females libido increases during pregnancy and every female he knows has told him so. I feel terrible cause it's not his fault it's the baby's. Anyone out there with a similar issue? Oh and too top it off I have terrible sciatica pain :-(