nervous!

I'm going to the doctor in about an hour to get an ultrasound. yesterday at my routine weekly visit he did a quick ultrasound and noticed some calcification on my placenta. he wants to do a more thorough one today to get a better idea of the extent of calcification. he told me more than likely he'll be taking baby next week (I'll be 38w Saturday), but it may be sooner depending on what he sees today. I'm trying to be positive, but I'm so nervous! does anyone have an experience with this?