Advice please

Advice please - I’m trying to get pregnant after a miscarriage January. It was unplanned but we were happy about it. Historically in our relationship of 2 years my boyfriend finds it hard to come through sex. I think when we got pregnant it was a fluke, I really want to fall pregnant again and we have been trying but the last 8 weeks or so he won’t let me touch him and avoids sex at all costs. It’s so awkward and he gets angry when I bring it up! Not to mention I am getting so frustrated we are on holiday and nothing. How can I ever fall pregnant? Please help anyone who has been in a situation like mine. P.s he has a child from a previous relationship so feel he’s not as bothered as me! 😔