help, freakin out

I am 4 weeks and 2 days pregnant with my first, and I feel perfectly normal. Nothing has hit me yet. I am so scared to eat hardly anything because I don't wanna have a miscarriage.. every time I look up if it's okay to eat something it says it's not good and causes miscarriages... I'm trying my hardest not to think about it but I can't.. only 19 and my husband is so excited and so am I. Just the thought of losing our baby freaks me out. Does anyone have any advise that would help me out? Please