Preeclampsia.??

I went to the baby doctor today and my blood pressure was a little higher than it normally is. The doctor has blood work orders that I'm getting done tomorrow to make sure that I don't have preeclampsia, I've had no symptoms but I also read that it may not come with any. I'm a first time mommy and I'm 29 weeks & 3 days pregnant with my little girl. Does anyone have this or has anyone had this? I'm trying not to worry or stress over it but I'm just so scared!