Stressing about miscarriage

My best friend has been TTC for over a year now and I found out I'm expecting on Sunday. She had a miscarriage last summer. I'm paranoid that I will have a miscarriage. :( my first pregnancy was perfect(this is my second). I don't know. I don't have insurance yet, but I go get a verification pregnancy test done for medicaid next Monday. I've got 5 positive tests since Sunday(last one taken the 11th)and I just feel like I need to keep taking them to reassure myself. :( I'm only 4w3d. Anyone else feel the same?