Hi S.,
I'm so very sorry for your loss. That is such a hard, hard thing to go through. I have not had this happen to me, but I do have a friend who delivered around 25 weeks because of preeclampsia. Her baby did survive, but it was a very long road. She went on to have another baby a couple of years later. That pregnancy went just fine. At around 37 weeks or so, her blood pressure was getting high again, so they delivered her son, who was perfectly fine. One study I read seems to indicate that a high level of exercise can be a culprit in preeclamsia. Be careful that you don't overdo it. My friend is a runner, and continued running and exercising a lot in her first pregnancy. It could have been a factor in the blood pressure thing. (much more work on your heart during pregnancy) Try to relax and enjoy your pregnancy. I know it must be so hard with your loss in your mind. I know that I find great comfort in resting in God's perfect will for my life, knowing that He ordains all things for my good and His glory. I don't always understand how that all works together, but I have such peace about the hard things because of that. If you have a faith in God, perhaps this will help you, too. Blessings to you. Again, I'm so very sorry.
Oh, I forgot to mention this, but you probably already know it: eat lots of protein. Almonds, yogurt, chicken, meat, beans. They are critical for helping your blood pressure stay in control.