Oooh, don't get me started. I'm a big lass, with a BMI of 37 when I asked to be booked for a home birth. I was sent to a consultant, basically so he could try and intmidate me to changing my plans, but I insisted pointing out that I wasn't in any other risk group and that was that. BMI is only measured at the start of your pregnancy though, so I wouldn't worry.
The midwives kept looking for reasons to prevent my home birth all through my pregnancy, I remember the glee on the face of one of them when my BP seemed high, but thankfully I'd read up on possible pitfalls and the problem wasn't my BP but too small a cuff. A large cuff was ordered and my BP remained normal despite the hassle I had to deal with.
Another issue I had to wrestle with was the "big baby" problem. I have a theory about this- I'm a big girl so all the medical professionals assume I'll have a whopper. My fundus kept measuring big. I personally think fundal measurements are incredibly inaccurate, particularly when your midwife expects a certain reading, seek and ye shall find syndrome. So after much doom saying about the terrors of shoulder dystocia and wild speculations on what could be wrong with my baby I was reluctantly sent for a scan at 36 weeks. Baby measured in the 99th percentile- a whopper for sure! Surely you'll reconsider your selfish desire for a homebirth now, exhorted my midwives. My DD measured in almost exactly on the 50th percentile when she was born- 7lbs 14 ounces. Not exactly a whopper. No problems with shoulder dystocia as well, in fact, the midwife who attended the birth of my daughter complimented me on how well the second stage of labour went.
If you do get any hassle about your BMI, which I doubt you will, just stick to your guns and check out these websites
Junk Science about Obesity and Childbearing-
www.gentlebirth.org/archives/junkObesity.html
Home Birth Reference Site-
www.homebirth.org.uk/
The Plus-Size Pregnancy Website
www.plus-size-pregnancy.org/