timed intercourse struggles help please

I've been ttc for 2 years. I got pregnant on my 2nd round of letrozole and had a miscarriage. That was back in May and I've been trying ever since and still nothing. We're doing timed intercorse and sometimes it's a struggle. How do you do it?? Sometimes feels like my partner doesn't want to have sex with me. And we're supposed to have sex on certain days. And he's not into it. He acts like it's a chore. I'm starting to get depressed i feel like I'm never going to get pregnant again. idk what to do. Any friendly advice?