Did you carry your very first BFP?

Maybe I  being paranoid, but I feel most women on here have had a miscarriage or two before actually carrying a baby full term. I keep hearing stories of cases like this and seeing people posting their sad news here and I can't help but feel panicked. This is my first time pregnant, I am 7weeks and feel I shouldn't expect this pregnacy to continue as it's still low chances it will. I keep planning for the future, picking names and planning the nursery to stay hopeful. So I want to know what are the chances of carrying your very first?