I’m 19w and my bf doesn’t care that I have no drive

Im 19 weeks and I just don’t have a sex drive. I’ve struggled a lot with depression during this pregnancy, and my doctor put me on Zoloft. I wasn’t handling things with a level head. My boyfriend is constantly trying to make me have sex with him. I still get nauseous all the time and he doesn’t care. He still wants head from me ,and I sometimes I give In because he won’t stop. It’s like it doesn’t even matter to him. Sometimes I wake up to him just putting spit on me and trying to penetrate me. I let him do it sometimes, but he has such an attitude if I don’t give in to some kind of sexual favor somehow. It’s not fair. I know I’m no good right now. I’ve told him to watch porn or do whatever. At this point I don’t even care. I gave in this morning and he was STILL MAD bc I didn’t get on top. I’m just over it. I was just trying to go pick my daughter up and have a good day off work.