Asking for a male friend: I hooked up with a girl 6 months ago now she says she’s pregnant?

Anonymous

I hooked up with a girl about 6 months ago, just before I met my current girlfriend. I haven’t seen or really heard from this girl since and don’t even have her number saved in my phone.
Out of the blue I get a text this week from an unsaved number saying that she hasn’t been feeling well and she’s going to take a pregnancy test and would let me know. I asked who it was and she’s just like oh you don’t remember me? Never gave me a name. She then said it was positive but she was going to take another one to be sure the next day.
So I text her the next day to ask how she’s feeling and what the second result was. No response. Now I’m just baffled and of course my girlfriend is crying and mad and ending out relationship if it’s true. It just doesn’t make sense. First why would she have waited six months to say anything and before taking a pregnancy test? And why is she not giving her name and now not responding? It doesn’t make sense to me. Since we haven’t had sex in 6 months I feel like it’s not even mine she’s just looking for somewhere to put the responsibility or trying to get a relationship/someone to take care of her but I don't know what do I do now?

Asking for a male friend: I hooked up with a girl 6 months ago now she says she’s pregnant?
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