Yeah, I thought maybe she just wanted to get back together or discuss something else maybe...
Maybe she just wanted to assess your reaction, so it could help her decide when she would know 'for sure'... or just wanted to share it with someone, cause she was taken aback too, and didn't know who else to tell... In some places it's even required by law I think, to notify the father before making any decision? (Or was that just being talked about?)
It depends why you broke apart, some people get together again if there's a baby in question, not sure if that's possible or even recommendable in your case... Depends on the circumstances...
Sometimes people even got together/got married because of a baby and then it was a miscarriage/stillborn or something... So, you never know what may happen even if she'd be pregnant... (I don't wish it on anyone though!! Hope it all goes well no matter what the result is and however you might decide!!)
Some girls may even say they're pregnant when they aren't, 'to get a man back', so it's probably good to see any test results or such, or go to the doctor together with her.. (for support too)
Maybe I sound overly cautious, but after the baby is born, it's probably good to get a paternity test too, I've heard of guys who paid child support for kids who weren't even theirs, and/or raised them as their fathers... (Again, I hope not! It's just something to consider maybe, later on)
If she would be pregnant I hope you two will decide together, and check all possible options... and get really informed etc. Some girls can't have a baby later after abortion, that may be a consideration too...
All kinds of families exist these days, even if the two of you wouldn't be together, you could still be a dad and an important person in the baby's life... Many divorced dads love their kids very much too, this doesn't seem much different... There are even single dads out there, some are very admirable...
So, whatever happens, good luck!!