I haven't ever moved up a time frame for getting pregnant myself, personally...

 but I've had many many m any clients who have - most common reason was
endometriosis, although dysmenorrhea or heavy menses would be some other
reasons.
 Frankly - everyone who *I* know of who has moved up plans...felt happy and
were glad that they went ahead with plans for children.  Most of the people I
have known were waiting for the 'perfect' time...they were waiting until some
'even' had occured (graduation, moving to a new house, etc)...and found that
having a baby a little earlier than they had planned didn't significantly
impact their plans and that babies can fit into our lives often better than we
anticipate.  =)
 That's just my second hand experience...for what it's worth.

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