Something wrong...?

Today is the first day that I've been concerned about my pregnancy. For the past couple of days I've been having on & off cramping but have been ignoring it. Today is the day that I realize I should call my doctor. It could be nothing but it could be something and I'd rather find out it's nothing then be worried all day. I have cramping and I'm very shaky. I'm quite worried but trying to make it until 8 when I can call my doctor. Dear god, please let this be nothing!