When I was pregnant with my son, all my teachers in school asked if I had preeclampsia (then called toxemia). My teachers diagnosed me with it, they said I needed to talk to my doctor about it. My doctor said I didn't have anything to worry about and poo poo'd my questions.
When I went into the hospital, the nurse started hooking me up to iv's and I asked what they were for. "the mag sulfate is for your toxemia, dear." you could have knocked me over with a feather! My doctor .T.O.L.D me I didn't have it - yet I did. I was on mag for 3 days after delivery. Yuk.
Obviously your doctor is taken precautions. You are on bed rest. You are getting an u/s. You've had blood work. It all sounds like you are being cared for and monitored closely.