Zero sex drive

Currently 19 weeks and have 0 sex drive the entire pregnancy. This is really affecting our relationship and making it difficult. Fiancé thinks that I’m not taking his needs into account and thinks that it’s “all in my head”. I tried explaining that my hormones are different and don’t have a sex drive whatsoever. We’ve tried having sex but it’s uncomfortable.. also the back pain, sore boobs and sore body just makes it worse. Anyone else go through this/what has helped?