When one person wants a child and the other doesn't, the "No" wins. Always. NO ONE should undertake having a child who doesn't want to have one.

And if she's bargaining and still thinking she can talk you into "just one" - she is revealing who she is.

After only 4 months there is no shame in you deciding this - it's not like you were in a ten year relationship then revealed you changed your mind.

The way she has handled this tells you a lot about her and her lack of maturity. (Make sure she doesn't sucker you back in for one last tryst that turns into an unwanted pregnancy btw).

Oh - and don't introduce your kids to anybody until it's been AT LEAST 6 months and you are PRETTY SURE it has long-term potential, ok?