<human>: We met online and have been talking since about July/August of last year.  We broke up for a while around Late Nov/Early Dec and started talking again around Mid January.  She said it was tough to have a long distance relationship.  She lives about a hour and a half away from me.  Since we started talking again she's come up to see me and I've gone down to see her a few times in the past month.

So tonight she told me she was late with her period and was a little worried.  This was a surprise to me since we haven't had sex yet.  I said, "You'll probably get it in a few days."

She replied, "What if I don't?"

"Why wouldn't you?"

"I got messed up and had sex with (Let's call him) Bill a few weeks ago, I'm sooo sorry, I understand if you don't want to be with me anymore."

She's 17, 18 in a few weeks, and a bit of a fan of trees, if you know what I mean. I'm 19, not a smoker.

She went on to explain that she's about a week late and has been feeling sick for the week, and is going to get a test in the coming days.  We weren't in a relationship at the time, just talking online and over texts and the "encounter" was before we met for the first time, around Feb 5th.

In the time I've known her I've fallen in love with her and I still want to go out with her, but this is a big decision.  She hasn't thought about what she's going to do if she is pregnant, she says Bill doesn't want anything to do with it.  I don't know if I would be ready to have a pregnant girlfriend much less the kid that comes along afterwards.  I just need some advice, thanks in advance for any help.

Can you summarize the given text in a few sentences?
<bot>: GF might be pregnant from a sexual encounter she had when we were talking after meeting online, but hadn't met yet, I just got told after being in a relationship with her for a month.