High BP

Isabel
Question any advice would help, I'm 37 weeks tomorrow Yay anyway I had a high BP reading on Tuesday when I went to see my OB he said to monitor it at home and rest yesterday it was high again so I called and he had me go to L&D got there first two readings were high they laid me on my left side and the next 3 reading were perfectly fine, I got sent home this morning while laying on my left side I took my BP it was perfect sat to turn on my tv watched a show and took it again (about an hr and half later) high again, I've been now laying on my left side for about an hour took again and it's perfect so my question is this is this something to be concerned about should I call my OB?