Boring sex life

My husband is very loving and caring however he can also be boring to me. Our sex life was amazing when we were dating almost 9 years ago and now we’ve been married for 3 years and sex has been not consistent at all. Now that I’m 5 months pregnant we maybe have sex once a week or once every other week. I tell him I want it more but for some reason he doesn’t take me seriously. It’s like I almost don’t turn him on or he doesn’t find sex appealing and it’s frustrating me so much!! I was gone for 5 days visiting my parents and I come back thinking it’s finally going to happen but nope, nothing. We both work from home together 3 times a week and even then nothing happens, I even have tried grabbing him and he will get hard but it doesn’t push him to say ok let’s have sex. I am beyond frustrated about the inconsistency in our intimate life and it honestly depresses me because I know it’ll only get more difficult once the baby Is here. I know he has a sex drive because he told me he masturbated while I was gone and that makes this whole situation feel even worse. I imagine that this is what it feels like to be cheated on, and it’s even crossed my mind because of how unattracted he is towards me.

Is anyone else going through this?