What Quail said!
I had Pregnancy Induced Hypertension with my first and it is a beast. Exercise can help things and eating less salt, etc. The things you'd do for normal (non-pregnancy) blood pressure problems. The endgame for me was 7 weeks of complete bed rest to keep it from developing into pre-eclampsia (and I had to be induced at 37 weeks). If you're not spilling protein and the Dr didn't seem concerned then I wouldn't be. They can also put you on BP meds if it gets to be too much of a problem.
Probably the best thing you can do about it is NOT FREAK OUT!!
I know that's hard, but stress makes things much worse.
ETA: I meant to say that although I was on bed rest and had to be induced pretty early everything went great. I was able to deliver vaginally and my son is a happy, healthy 2 year old who's no worse for the wear. I even had a second one 22 months later (with zero complications)!