Germaine, 
I'd wonder if the pituitary problems were affecting her prolactin  level.  If 
her prolactin level was high, she may have trouble getting  pregnant.  That 
can be treated, but it should be looked at closely.
You have a great resource at MGH for these questions.  Call Dr.  Corrine Welt 
at 617-726-8437.  She's a reproductive endocrinologist who is  also doing 
research with giving prolactin (vs. placebo) to mothers of preterm  infants with 
poor milk supply.  She may be able to help you with these  questions.  She's 
has always been happy to help me when I have these kinds  of questions.  
Good Luck!!
Maureen Allen

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