I've got pre-existing high BP, the bottom number is the one they worry about the most I think, I was told if it goes over 100 I should go to the hospital, I'm on meds and have been since day one, they are very safe and keep me on an even keel my bottom number rarely goes over 85 now and the highest I have recorded since being pregnant is 98 when I was ill. If you feel that its higher than you'd like tell your midwife or ask her to explain what is safe and what is not, its such a pain that they write stuff in our notes but dont explain it, I think a lot of mw's need to brush up on their communication skills!