Feeling lost

I'm feeling down yall. My sister passed away 3 years ago, at the age of 25.She had organ failure and had a liver transplant when she was 13 years old. My husband and I were planning our wedding for June 18th 2016 and my sister knew she was gonna leave us. She asked me if my then fiance and I could get married sooner, and we did. We had a private ceremony February 19th of 2016. Exactly 2 weeks later from the date I lost my sister/ best friend. I feel so lost without her. She loved my husband and I know have a 2 year old son and I know she would have been crazy about him. About 2 weeks ago I thought I heard my son call my sisters nickname but I didn't think anything else of it, and i didnt tell my husband about it.Then about a week later my husband told me he thought him say my sisters nickname too. I know she's watching over us and playing with my son. I just miss her so much. I wish she was still here alive and well but I am at peace knowing that she is not longer in pain and suffering.