it is very VERY rare for a tilted uterus to cause fertility problems
about 20% of women apperently have it
the biggest problem with it is its supose to make sex very painful, but it does not decrease your chance of fertility
usualy when your pregnant around 10-12 weeks your uterus will straighten out because of the growth of the baby, if it doesnt then there is a risk of miscarrige but that is also very very rare
also a tilted uterus can be a sign of an underlying condition like endometriosis or pelvic inflamitory disease, those can affect fertility, if your doctor has checked for these and you dont have them you shouldnt have any problems
go to google and type "getting pregnant tilted uterus" and thats where you will find my sources....i looked at a bunch of those
on a similar note, my mum has a tilted uterus and she has 4 kids that she concived naturally (eww so dont want to think about that) and carried to term
~alicia~