Question about miscarriage

Good morning.  I have 2 healthy kids with a miscarriage in between.  It was a missed miscarriage with no indication that anything had gone wrong.

I am pregnant again -- 5 weeks -- and am worried about miscarriage again.  I'm wondering if anyone can tell me the liklihood of another miscarriage -- specifically a missed miscarriage that I wouldn't know (no bleeding, loss of symptoms
, etc.) if i already one.  

Thanks for your help.

I posted this in the m/c forum as well, but would welcome all input.