Well the first thing you should know is that fortune telling isn't exact. Your future changes with every choice you make. What a fortune teller would see is a thread of the future, sort of like what could be.
Don't think that if a fortune teller says you will get pregnant and then you don't, it just means that either the fortune teller isn't real, or you changed your thread, doesn't mean you want have children, just means not right then.
The same goes for the marriage, sense fortune telling is just seeing a thread of what could be. No one is exact on if a relationship is going to last or not.