You BP is on the high side (anything over 140/90 is normally classed as high)
What was it at booking? It is more to do with your increase since booking (i.e. your "normal" BP) rather than any one reading.
My booking BP in my last pregnancy was 135/90 (i.e. "normal" but only just) - it went down in the 2nd tri (which is normal, due to preggo hormones relaxing blood vessels) and then started to rise again in the 3rd tri. They did keep a very close eye on me in the 3rd tri - weekly BP at first, 4 times a week by the end (& I was signed off work from 32wks) They only started to get concerned when mine went up to 150/100 (which is when I was signed off & had a couple of days in hospital until it went down a bit)
Luckily mine was just a HBP problem, not pre-E related.
However for someone with a booking BP of 110/70, a BP of 150/100 would be classed as serious. So it really depends on where you started from.
At this stage it's unlikely (but not impossible) to be pre-E related, as when pre-E starts early it's normally after 20wks.
They can do extra scans to look at placental efficiency if the pregnancy is complicated by HBP and/or pre-E & to make sure baby is growing properly. I had one at 32wks & 36wks. so ask about them if they aren't mentioned.
I'm sure they will monitor you closely & sign you off or whip you in to hospital at the slightest sniff of trouble - but if they don't nag them until they do!
good luck, I hope your BP doesn't get any worse.