I know there are people saying not to advise medically, but some of us have been down your road so I'm going to pitch in my story because honestly I'm livid that anyone has suggested termination to a vulnerable and scared woman with a wanted pregnancy at this stage due to pre-e unless it is very rapidly progressing and the life of the mother is currently at risk which you've not indicated yours is (and frankly if you're posting and being left to make a decision it seems less likely). You do not need the extra stress and if you go on facebook and search for parents of premature baby groups you'll see that there are scores and scores of 23 weekers born small for dates who are thriving. The baby in the incubator next to ours was born at 425g, less than 1lb, and she went home without even needing oxygen support. I last saw her at 5 years old and aside from having a muscle delay on one side (struggled with fine motor grip but doing physio) her mum said you'd never know she was a prem.
Do you know your numbers for kidney and liver function. Even the basic ones being if they've categorised you as spilling +1,+2, +3 or +4 protein? Have they done steroid injections (they aim to do these 24 hours apart when your numbers look like you're likely to deliver in the next week, that's their optimum window). Honestly the tests do show them a heck of a lot, but how they are reacting to those tests can tell you as the patient a lot more. If they haven't done steroids they don't seem anything that makes them think you're at imminent risk of delivery. They would do these even if you were considering termination because they make such a huge difference to lung function that it keeps both options open at no risk. My favourite NICU consultant once told me 'don't panic unless you see me panicking' and he was right, if the doctors aren't running, things aren't dire.
I developed hypertension of pregnancy at 12 weeks, progressed to pre-e by 19 weeks. I had scans 3x a week until 23 weeks at which point I was admitted with +3 protein. I was on max labetalol by 18 weeks, had also maxed the nifedipine by 24 weeks and topped out the methyldopa by 27 weeks. We had nothing left to throw at it at that point and I was still 185/145. We did twice daily scans of the flow through the cord for all 5 weeks to check for any reverse flow which would have meant the baby had to come out straight away. They brought med students in just to chat to me because none of them had experienced someone on such high doses and still tracking at such a high bp. I hung on there until 27+6 at which point I progressed to +4 and HELLP syndrome, however they were watching me like a hawk with me being admitted so delivered within a few hours. Baby was the size of a 22 weeker, below the bottom of the centile chart, spent 101 days in hospital, came home on oxygen, and is now 11 years old and absolutely fine. The fact your baby's head size is staying on track is a very good sign.
In regards to your safety you're in the best place. My consultant told me in his 40 years in obs & gyne (major trauma centre, level 3 nicu) he had only lost one patient to pre-e, and that was a patient who had declined all scans and midwife checks and was brought in unconcious after having a seizure at home. The ones being monitored in hospital he's not scared for precisely because they keep such a close eye on them.
After my first pregnancy I had a full blood panel to check for underlying conditions such as clotting disorders which are associated with an increased pre-e risk but nothing was found. I had pre-conception councelling and spent a long time talking to the pre-eclampsia foundation, because I developed pre-e before 28 weeks both my consultant and the foundation told me my chance of getting it again was over 95%, and about 80% that would be before 30 weeks. Second pregnancy I sent 4xdaily readings to the hospital and had home urine tests daily. I was on aspirin and calcium from day 1 (some docs won't start aspirin until 12 weeks). Aspirin was explained to me as it only helps about 5% of women, but for whatever reason in those 5% it's a pre-e miracle drug, for the rest it does nothing. From 20 weeks we did twice weekly scans. Again I had the huge BP rise and ended up maxed on all 3 meds by 26 weeks, however I didn't actually develop pre-e or HELLP that time, what happened was one of the scans showed the high doses of meds had caused the cord flow to deteriorate and they had him out at 29+1 when I felt absolutely fine, but he came out again the size of a 23 weeker.
My sister in law developed pre-e with +1 protein at 21 weeks, +2 at 24 weeks and then it just stopped. Her test showed she was very likely to need to deliver within 2 weeks but again she didn't. They monitored twice a week but it never went further, her baby was born by scheduled c-section at 38 weeks, just over 5lbs so certainly on the small side but fine. Went home within 24 hours.
What you're going through is scary, very scary and I wish any of us could make it better for you. Any decision right now feels impossible and it's horrific not knowing how to make it better or what to do for the best. However the survival and vitaly the healthy survival stats for 23 and 24 weekers have come on so so far over the last few years, but until you've been in the preemie world it just sounds impossibly premature.
Alongside all of this there is of course the raised chance of disability with an early prem, more so than a term birth. But it's by no means a guarantee, and of my group of 8 mum friends from NCT the two with children with severe disabilities were both born at term. Babies don't come with a guarantee.
I don't actually think it's a decision you'll need to make, but I hope your tests today are reassuring and you find a doctor who is willing to give you the numbers that can help you feel more secure.