So I have a identical twin sister who had a baby in 2014

So I have a identical twin sister who had a baby in 2014. First I didn't really feel like I wanted a baby but as soon as he was born I had to have my own. I got pregnant in October 2015. And unfortunately I miscarried. It broke my heart I laid in bed for days. Last week I dreamt I was pregnant. Now today May 10, 2016 took a home pregnancy test that came back positive. I have so many fears but I'm going to monitor very closely.