never had a pregnancy scare ?

I've never thought I was pregnant and my periods have always been on time . Is this normal ? It seems like everyone one else has atleast had one scare or seems to be extremely fertile . I have been off birth control now for over a year and a half now and although I am not trying to conceive just yet should I consider going to the doctor ? How is it that everyone else I know seems to be getting pregnant so easy. O.o (my s/o never cums inside and. Do keep track of my fertile days. So maybe I'm just really good and being safe and others just don't care ?)