well...
i think one of the possibilities for small for dates woudl be because of a lack of blood flow, and that hasn't presented as a problem yet.
the other factor is that if your bp does rise then you'll be treated with beta-blockers, and women with beta-blockers tend to have smaller babies. not teeny weeny ones, within normal ranges but just smaller. so not much to worry about there.
pre-eclampsia afaia is a disease of theories... all they know is, have placenta, may get pre-eclampsia. no placenta, you won't.
so i don't know if there's much to be done, really. try not to get stressed (although wtf does that mean and it might be a bit of a red herring anyway wrt pre-eclampsia). if you think that taking your own bp will calm you, then do so. it might not, however, and a lot of docs don't like patients using them.
i always threaten with PE, it is a pisser, but surely you should take comfort from the fact that you don't actually have a single PE symptom? the chances of you developing any in the next ten weeks or so are extremely slim, tbh, and even after that you can start meds to control the bp.
if i'm being honest, i think that you've probably been unnecessarily scared by teh docs here wrt the PE. they're keeping an eye on placental blood flow, that's the main thing. i was scanned once a month, now get scanned once a week as am later on than you, everything's fine, but the sonographer told me that even if it isn't fine as such, babies come out fine and dandy with far-from-perfect placental blood flows, so as long as tehy're monitoring then it's fine.
plus, my bp is majorly wonky and i have had some swelling and visual disturbance and headaches and the baby is measuring not huge etc but one swallow does not a summer make. so it sounds like you're getting great care, i'd focus more on that and your complete lack of symptoms than i would the possibility of developing PE in the future.
my obs, who has a big brain, reminded me that i was being monitored and that most women with PE come into the hospital feeling really, really, really, REALLY lousy and it's the first the hospital knows of it. PE will NEVER get to that extent with us because we're already in the system.
good luck with everything. no googling.