Trying not to stress!

I just found out I was pregnant last week when I was supposed to have my period...I took like 4 tests and all were light but definitely positive. I haven't had bleeding at all and have tender breasts...for some reason I am still worried that this isn't real! I am also very worried about a miscarriage since I have read so much on the internet...the second I have gas cramps or my breast feel slightly less sore I worry! Any advice on putting it out of my mind?