<human>: Last night my girlfriend and I were having sex and I noticed what appeared to be a scar from a c-section.  We've been sleeping together regularly since October (finally had the exclusivity talk last month and I've just been over the fucking moon), but I guess I never noticed since we'd always had sex in the dark before.  Anyway, I decided not to bring it up last night because we were having a great time drinking and playing with firecrackers (which, in retrospect, probably wasn't the smartest idea, but we had a blast), but now I'm wondering if I should have asked about it.  

Normally I'm all in the "JUST FUCKING TALK ABOUT IT" camp, but this isn't information that she volunteered to me, and it seems like there's a high probability of it being a sensitive topic.  I know dating as a single parent can be hard, especially in your early 20s, so some don't always disclose about their kids right away.  I totally get that, and I don't think I'd be mad if she hid it from me, but it *is* something I'd like to know before I get any more involved.  On the other hand, what if she gave a child up for adoption? Or had a stillbirth?  I don't think it'd be my place to ask about that kind of thing without her bringing it up first.  We've talked about really personal stuff before, but I feel like that would be on another level, and prying might chase her away.  Or maybe the scar was from some other surgery that I'm not familiar with?  

I'm not going to ask her about it tonight since I'm still hung over and want to think about it with a clear head.  In the mean time, I'd really appreciate a third party opinion before I go off and do something stupid.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: New girlfriend has a scar that appears to be from a c-section.  Ask about it or mind my own business?  If the former, how do without being a jackass?