I was put on labetalol for my bp at around 33 weeks last pregnancy. My blood pressure went back to a normal level from the first day on them and remained that way until 38 weeks. There probably isn't alot to worry about with your bp at the level it is but it can very quickly become a problem if untreated so it is best if it is kept under control.
When my bp went up again they also found protein in my urine so I was officially a PE patient and was sent to hospital to get bubs out. I didn't like being on the meds for so long but neither my son or I had any problems related to them, and they bought him a whole lot of extra time inside. Try not to worry too much, your carers will keep a close eye on you.