I'm thinking of busting my load inside of my girlfriend right as the clock strikes midnight
Why do that?
I was thinking how it will be so romantic, so full of love
It's fine to do this at midnight. But make sure she wants to do the same.
She would never say no to my plans, she'd love to do that at midnight.
It sounds like you and your girlfriend have a very loving relationship, but I have to emphasize that you should only do things like this if she wants to, as well.  Don't presume that she is interested, and make sure that she is okay with unprotected sex.  If you are both trying to conceive of a child, then this is fine.