Is it normal to worry constantly about miscarriage?

totally normal.. and the worst thing you can do in early pregnancy is search the net, you will inevitably come across horrible statistics that make you freak out about every tiny aspect! dont worry too much about what you have done when you didnt know you were pregnant, chances are if your not doing them now and your still pregnant than they havnt caused any damage. as for most of the food your suppose to avoid, its not the actual food thats the problem, its the risk of bacteria in the food that could be harmful.. if you didnt get sick your bubs most probably just fine in there. i know it doesnt seem it but the fear of miscarriage will p in a few weeks and you will feel more confident that you'll be holding your baby in no time :) i know its pointless to say this because it doesnt stop you worrying, but worrying wont do any good so just try your best to think positively and chances are your baby will be just fine. goodluck!!