another one here to give reassurance that you will be ine. bmi of 39-40 and 39 years old during pregnancy, had the baby in january.
be firm with your hcps. i begged to see a nutritionist early on but didn't get to see one until well into second trimester, which i think really missed the point
. he said he could tell i knew what to do, and when i said i wanted to try for a weight neutral pregnancy, he advised that i should expect some gain and not to worry about it.
in the end, i put on 14kg, almost all in the last trimester. when i got home from the hospital i was dismayed to find i actually weighed more without the baby in me
but by the next week it had all fallen off and i was even 3kg down. it was flui, which also explains why i could not walk, by the end!
at my booking in appointment, i was told that as i was low risk, i could go to the birth centre. at around 32 weeks, they started to waver on that point and then i was told it would not be possible after all. i pushed back and said they were looking at numbers, not the person. i met with midwife at the birth centre and after a lengthy chat she agreed that they would have me after all. however, at my request she also gave me a tour of the labour ward and i elected to go there in the end. it was important to me that i had a choice!
also, i was referred for an anaesthetist appointment. pleased to say this lasted about two minutes, most of which was him writing in my notes that i could have an epidural whenever i liked. 
labour was pretty bad but that's another story and not bmi related. mother nature is kind and makes us forget the worst of it! i could not now tell you what a contraction feels like... 
this was a bit rambly but i hope it may help those of you going through everything now. happy to answer any questions too.