first pregnancy!! scared

So me and my husband decided we wanted to start a family around summer of last year.. we waited through the holidays and got my birth control removed in January.. well we did the whole "tracking ovulation" and what not and this last month, we didnt stay on top of it as much as we ususally do and just did out own thing. Well i was supposed to start my period 4 days ago and didnt. i just thought i was stressed lately so i was probably late.. i felt fine, wasnt sick or anything like that, and then i went to go eat my favorite food today and it almost made me throw up. i decided why not and took a test.. it came back positive... Im freaking out!. im scared and nervious and everything i didnt expect to feel. Please tell me this is normal. Yes we were trying and all that but i still got scared. I hope this is normal for a first pregnancy