AITA for not wanting to pay for my sister's pregnancy expenses?

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The original was posted on /r/AmItheAsshole by /u/Ju29ro- on 2023-10-06 20:11:25.

I'm 32 m and she's 27 f.

This story starts two months ago

Neither her or her boyfriend are economically stable and she got her pregnancy test positive. Their decision is to keep it apparently, despite the less than ideal circumstances.

She asked our parents to pay for the expenses but they are also not in a good spot financially (I often lend them money and then they return it after a few months), so they asked me to borrow money from me in order to help her

I told my sister that she should not put our parents in that spot knowing the troubles they already have.

But against my better judgment, I sent money. The first amount was already double of what my parents usually ask me and now I just got another request of the same amount

I'll be straight up honest here, I don't think I'll ever see that money back and I don't wanna pay anymore than I already did. I said it openly and clearly

Now of course I'm the devil himself for not wanting to give away a chunk of my salary every month for something that I should not be held responsible for

So, aita?