Does it really means when a woman dreams about catching crayfish she's pregnant?

No, dreams of catching crayfish are limited to people who have experience in catching, cooking or eating crayfish, and have nothing whatsoever to do with pregnancy. Most folk traditions have stories of some sort connecting different types of dreams with pregnancy - or death or marriage or floods or fires. These superstitions began when someone's great-great aunt dreamed about crayfish, and by golly, she was pregnant! But all the times someone's great-great uncle or second cousin dreamed of crayfish are conveniently forgotten.

> Unlike great-great grandma's time, today there are nifty pregnancy tests available at every drugstore. They are far more reliable than dreams of any sort when pregnancy is suspected.

> See the link below for more examples and discussion about dreams and pregnancy/babies.