It sounds like they are just keeping an eye on you b/c of a few irregularities. I too lost weight whilst watching my sugars and my OBS wasn't worries either.
If you do have preeclampsia, they will possibly induce you early b/c of the risks to you and bubs. I am sure there would be some info/a thread on BB in relation to this.
I haven't got high blood pressure but I know some of the other ladies did whilst pg and some of them were just monitored, others were put on meds. Try not to worry too much at this stage, they are collecting your urine etc.... to figure out what is going on and what course of action, if any they will take.
Keep us updated, good luck