Nellie...
Congratulations! And also congrats on your 1-year anniversary (that's when I found out I was preggo with our number one, too.. right around our first year).
DON"T WORRY! All will be just fine.. I agree with Tate that you should double check on what meds to take or not take..
Also make sure you're taking a prenatal vitamin and drinking plenty of water..
There are lists and lists of things to avoid (fish, deli meat, soft cheese) but you can find those as you search, or ask your doctor.. You've got the big ones.
I would have to say the BIGGEST and best thing you can do for that baby is to take care of yourself

BE HAPPY. Enjoy these moments and relax as best you can.
Please let me know if I can help you in any way..
Sarah