Anxiety

I am a very anxious person to begin with. My husband and I had been trying since about last March. In January I had an HSG test to make sure all was working properly, and in February I started my first round of clomid. And in March, yay, we found out we were expecting. I'm 5w2d. This is my first pregnancy and I'm thrilled, but I can't help but feel that the thought of miscarriage is looming over me. Sorry to be a downer. I've only known for certain for less than a week and the feeling hasn't improved. Am I the only one feeling like this?