Congratulations!!! Keep doing what you're doing.
Same happened to me this time. I wasn't hoping to get pregnant till next year, so that I could get down to my goal weight and maintain for a while. I already lost 36 lbs and found out a month ago that I was pregnant.
Like you, I couldn't believe it. I kept checking on the test thinking the line would go away but it only got darker. LOL
I'm in my 10th week and only gained 6 lbs. It is possible to be fit and healthy during pregnancy. I'm trying hard not to go hog wild, eating everything in sight like I did with my other pregnancies. I'm hoping I keep up the good work that I started this year.....to continue to have a healthy eating habit.
You can do it!!!