Nah you won't cause its a baby attached. The baby stimulates different hormones I'd imagine.
First comment is right. It is a different hormone. :) don't worry about that. You can do it!! And you will be happy you did
It's natural to think that way now because that's all you've known your breasts for up until that moment. But once it happens you'll feel differently. You might even find that you won't want your SO to touch them anymore because they 'have a different use' now.
Yea that was deffinently never an issue. No need to worry.