+1 Protein at 25 weeks...
I can't answer your question, but I just wanted to say that I've very jealous of your BP! I don't think I've ever had mine read that low.
Perhaps your MW wants to know if it gets above 140/80 because that it too high for when you're pregnant (and too high to maintain for long periods of time when you're not pregnant.)
I'm not sure I have an answer either, but I had protein at +1 last week (at 24 weeks) also and my mw wasn't too concerned. (my bp is also typically very low, and a bp of 120/80 for me, at least would be high)
From what I understood from my mw, it's not as much as one reading that is of concern but changes over time, which I guess she's having you monitor your bp more closely,