how to heal

I loss my baby in November. An ectopic pregnancy forced me into emergency surgery. I cried more than anything. The pain from the loss was unbearable. I prayed harder than ever for god to protect my baby-- but I lost it. Now, I just found out my sister is pregnant. While I'm happy for her, I feel great sadness. She's 8 weeks. I was 8 weeks when I had my miscarriage. She concieved when I lost. I think I'll feel this sadness whenever I hear someone is pregnant for awhile-- I just wonder how long?