Small body = harder vaginal delivery?

I am FTM, also quite petite at 154, 38kg before pregnancy. No signs of baby coming out for me either at 38 weeks now. My pelvis hurts like mad, and got breathing difficulty because no space in belly already and baby is slightly larger than normal, still a lot of fluid in my womb (causing my tummy to be quite big and heavy). Doctor says will induce before baby gets too big and if no sign of labour at 39 weeks. I am also pretty worried. Don't think smaller body will have harder vaginal delivery, but I think the larger the baby the smaller the pelvis, slower the dilation, would make it harder tho. If your body is small but baby is less than 3kg then prolly should not be a problem? Sometimes the bump is big because there is a lot of water inside, like mine. Problem is my baby is more than 3kg at 37 weeks. If it grows too fast within these few weeks, then prolly would have a harder labour 😔