You're fine to dye your hair, it's only in the last few weeks that it can affect the baby apparently (my mum is a beauty therapist and works with the hairdressers, so a few of them that did my hair told me that) - opinion does vary from hairdresser to hairdresser though, so, I think it's more a personal choice. As long as you're not dying your hair every week, I think the one off dyes will be fine.
One thing to watch out for though is your hair not taking the colour properly, I think the hormones can affect that.
EDIT - ok I didn't get to read all 5 pages either, but I guess it was a bit late for that comment.. ^ lol