It's a good BP, but is it a good reading FOR YOU? It sounds to me as if the doctor wasn't just taking for granted what a standard reading would mean in general but what it "could" mean for you specifically.
That said, in my last pregnancy I had a similar situation. My normal BP is 70/120-130. During that pregnancy it was 90/130-140. My age was considered a factor, there was a lot of stress and anxiety in the extended family to worry about, my husband wasn't working at the time, and I was chasing after a preschooler and undiagnosed lactose-intolerant autistic toddler. Fun times. Within a year of delivery my BP went back to "normal."
So I guess my point is to consider where you are in your pregnancy as others have suggested, but also consider the stress levels in your life too. Consider that this pregnancy could simply be very different than the others, and maybe even putting more stress on your body than your previous pregnancies. All of that played a role for me as well.
In any case, I do hope that your elevated BP is nothing truly abnormal. Try not to stress out about it, since that can just make it go up more. :-) And who knows... maybe the stress of the situation with the appointment raised your BP and the next appointment going smoothly means it'll be back to where it should be.