BFP and terrified of Mc. No doctor till 12 week?!

I just got my BFP yesterday and terrified of a miscarriage! Cause I know it very common the first 12 weeks! Anyone se?! What helps ease your mind. I was told just take prenatal vitamins and don't go to doctor till 12 weeks cause there is nothing they can do if something happens before then. Ugh worried! :(