Did i say something wrong to her?

or did it bring it up during a bad time? My girlfriend and i have been dating for 3 weeks already. This morning when we were talking, she mentioned how tired she is because shes been taking care of her brothers 3 kids all day, and then found out about her 17 year old cousins pregnancy. Then, just out of curiousity i asked her if i was someone she could see herself LOVE? and she responded in, "Yes, posssibly." and i sarcastically said "ohhh i love two word responses, if you really dont see me as someone you love you can just say it to me you know".. it was all for jokes though. But now she just hung up on me cause she wanted to be alone. Did i do something wrong?!!