More scared then happy

Short story, my DH and had our firston November 25, 2009. She was a beautiful baby weighing in at 9lbs 2oz she is now 7 y.o............ I got pregnant after 7 years of trying after our first, in August, December 6th we found no heart beat and baby stopped developing around 12-13 weeks. We went and are gng through a lot with this loss. Now this is our 3rd month trying and we got a BFP, but I'm not sure how to feel about this. I'm scared and nervous. I'm not sure how to feel. Not sure what to do. I want to take every careful step I can. All I want to do is lay in bed and not move for fear of losing this one. And I'm afraid to get attached, I don't want to go through it again. I hoping for a very healthy and happy pregnancy.