Hi, I assume you've had the uterine doppler and this is why they suspect pre-eclampsia may occur?? which if so would be why they are giving growth scans too incase of IUGR.
I'm in the same situaton if so.
The first thing I want to say is growth scans are normally a pile of poop, yes they tell you if baby i growing or not, but the way they guess the weight is completely unpredictable tbh, I had them with DD told she would weigh about 2lb, she weighed 5lb 1.5oz, was told DS would would be at least 10lb, he weighed 8lb 7.5oz, so try not to let the fear of a big baby scare you.
If you would prefer a vaginal birth, there really shouldn't be a problem with you having one unless you do get pre-eclampsia and they want baby out now, in which case they will probably suggest a section, I know at my hospital they prefer you not to go over 38weeks because with a high doppler result the risks increase after that period.
However, they may prefer you to give birth vaginally because it is thought to be safer for both you and baby.
You say they aren't going to 'let you' go past term, well they have no choice, as I said, I'm in the same situation and having had 2 previous sections am not able to be induced so it's either wait for birth or have a section, they would prefer me to have a section, but as my consultant said, it is my pregnancy and my choice.
I personally do not like sections, although my second was elective and there were no 'problems' as such, it just isn't for me so I'm trying to get more research on the actual stats and risks involved if I go past 38weeks before I agree to book another c-section.
All I can advise is that you ask for every little bit of info on what the risks are for each procedure and decide on it based on your personal preferences and scenario.
If you do decide to have a c-section you can personalise it, it doesn't have to be all control taken away from you, if you take a look at this birth plan it has options for caesarians too so it's worth planning both eventualities.
If none of this applies to you and makes no sense sorry!