25 weeks pregnant & Sex

Hey girls. So I'm 25 weeks,not really showing as much I'm a FTM. But sex is already so uncomfortable, we've been doing missionary since it's a bit easier but he likes my legs on his shoulders with them pushed back, and that makes it hard for me to breathe lol. Any advice on positions that are easier during pregnancy? I dont want our sex life to be boring just because I'm pregnant. TIA! ❤