How can i tell if my fastskin is too small?

i got a new lzr racer pro (this type is legal according to the new rules) and i cant tell if the of the suit is too small...it fits but when i bend over to take a start it can start to ride up...but everywhere else fit very comfortably...the is just dangerously small when it comes to starts. I swim mid distance free and 200 back if this helps...i need help asap so any feed back is appreciated