guide to blood pressure?

[geranium]

Can anyone tell me what the higher and lower numbers mean in blood pressure readings and what should be a typical reading, if there is such a thing. I'm pregnant at the moment so having bp taken on a regular basis and my readings seem to be all over the place.

Thanks

[WigWamBam]

There's some information here about what the readings mean.

[geranium]

Thanks. Just what was needed.