High Blood Pressure

Hello. I have a history of hypertension and delivered my son at 30 weeks last year due to preeclampsia. I am now 10 weeks and took a road trip from Houston to Colorado. Now my bp has been 150s over 100s and I have had a headache all day. I hope it's just the stress of the trip and altitude. I see my doctor Tuesday but now I'm so nervous it's too early for all of this.