Possibly the reason it is fluctuating is because your body is going through massive changes in the way it operates as the baby grows? Your body has now become a life-support system for the baby, and will go through different phases and reactions as the baby's needs change, so there's no reason to expect that ANYTHING will remain static! The baby has growth spurts and rests, so you might be seeing a response to that, or any other number of different factors. Remember to ask about it in detail next time if you are curious.

As far as it being a concern, it's the diastolic (second) number that they focus on as being a danger point, and yours has remained pretty low, so I wouldn't worry unless that starts to spike over 90.

Kerrie