Actually 120/90 considered OK I thought? Usually BP goes up when unwell.
Pregnancy takes a toll on body. It's nature's stress test on how our bodies react when physical load is high. Our bp goes up when not able to carry the load. So resting meaning not over exerting, getting eight hours or more sleep and watching sodium level is important.
Also discuss with gynae. Mine put me on aspirin from 1st trim till 30+ weeks. It worked for me.
Hope this helps!