I 26m just found out I’m a dad and my wife 24f is not the mother.

Hello. I don't know what to do. I have seen similar post here on similar issues but can't find them to look at others' advice.

Last month, I got a call and finally answered it after it called several times, leaving several voicemails. I thought it was a spam caller or a horrible joke. It was from the mom of my high-school ex-girlfriend. She explained that, unfortunately, her daughter died in an "accident," and my daughter had no place to go and was wondering if I could take her in. I asked her to repeat herself for 2 reasons.

1. My daughter?

2. I have a daughter?

When I was in high school, my family had to move right before my senior year, and it caused my ex and I to break up, and we lost contact. I don't have traditional social media, and I was a rare case of not having a phone back then. Somehow, it came out that she said I was the father because she never was with anyone else. Her mom tracked me down and got my info. She currently has my daughter, but due to medical reasons, she can't keep her. I submitted to a paternity test, and it came out that I am 100% her dad.

Now I have been married to my wife for about 2 years. When I told her, it made our relationship rocky. She isn't against the idea but knows it will be a major change to our living arrangement and future plans. We online in a 2 bedroom apartment and planned for kids in 3 years. We are not set up for having a child. Plus, she at this point is a stranger and several states away. I have only seen pictures, and she looks identical to her mom. But she has my eyes and smile. I have no doubt she is mine.

Any advice is helpful at this point. Even if it is just linking me to past posts for a similar situation. Thanks.

ETA. I did do a paternity as stated above. She is mine. No doubt. Tested several times. Also, I know this has come up in the subreddit before. This is not fake or a joke. So, thanks for that.

I'm still getting used to the terminology. I made a comment about "her mom." That would be my daughter's grandma or my ex's mom.