It's the bottom number they worry about more than the top. Mine was okay until 33 weeks with my last pregnancy. I was admitted to hospital at 36weeks with high BP.

33 weeks it was 118/78
35 weeks it was 130/85 & taken about 5 mins later 128/82
36 weeks it was 138/90 & taken about 5 mins later 120/98 twice

I think they worry once it goes over 90.

Hope this has helped.