Pregnancy sex tips? (Rated R) ⚠️may make some uncomfortable⚠️

Hello everyone I’m Angelic, I’m 16 and 37 weeks 4 days pregnant I’m due Oct 16, me and my fiancé- (I know it sounds weird but I have a weird birthday in the year December, we were planning on getting married next year before I got pregnant we still are getting married next year tho)- my fiancé have been having issues with being sexually intimate, The baby is way to big, I can’t ride due to my bump hitting him, Missionary ends up with it going in the wrong hole or I get pregnancy cramps in my hips, We tried sideways but bump is to big, we tried him sitting and me bouncing and my legs give out after a minute, I can’t find anything on the web that’s useful, my mother encourages us to be intimate to help when labor comes but we have a strict boundaries of not talking about sex so I can’t really ask her on top of that it feels uncomfortable to ask her, I know this probably made some of you uncomfortable as well hearing about a 16 year old talking about intimacy but I really need advice on what could we try, doggy position is getting really old since it’s all we been doing since 30 weeks