Sexually Frustrated

I'm 26+1 and getting so stressed out about my husband and I's sex life. It was so fucking good in the beginning and now he doesn't do shit to want to please me. All he does is throw me on top of him and make me do all the work. I'm pregnant asf I'm not in no fucking mood to be on top all the time. I'll get butt ass naked for him, kiss on him and rub him (TMI sorry) and he'll change the subject by asking random ass questions like "where's my chapstick" and other stuff and I just get off him and get all quiet either lay on my back or turn around and just go on my phone. It hurts my feelings so bad and makes me feel insecure about myself.

I dont understand why he suddenly acts like it's such a chore to have sex with me.. I'll go out of my way to make him feel good and I get nothing in return.

What's wrong with me...