first pregnancy

Hey ladies! I'm guessing I'm around 6 weeks and 3 days, although I screwed up my period really bad the last time I had one with my birth control (I'm guessing that's what got me pregnant lol). I'm 19 almost 20 (I know I'm young), and my biggest fear is a miscarriage. I think I check & make sure I'm not bleeding at least 50 times a day! am I the only one that has this fear? I may be young but omg this baby is already so loved! I'm praying constantly that my baby will make it through the first trimester. I'm also a grand total of 95lbs and I'm 5'4. any other petite pregnant ladies? I'm not looking forward to having to search for petite maternity clothes!