High BP in pregnancy is serious, I learned that the hard way. Please dont try only home methods, keep your gynac in the loop with regular monitoring. Any headache, swelling or vision changes, call them right away.
Rest, low salt and keeping stress away help, but this is one thing you must not handle alone. Let your doctor guide the BP closely. You'll be okay, just stay regular with visits.
My doctor advised less salt, proper rest, left side sleeping and staying calm, and she watched it every visit. She said if it stays high, medicine may be needed and never to skip checkups. I just followed exactly what she said.