Sister in law newly pregnant

I’m not sure about my feelings on this.. but here it goes. I’m 20 weeks along and last week my sister in law revealed she is 5 weeks along with her second. I feel so much of my pregnacy and first born child’s attention is taken away with her. I just wish I was further along at least 6 months . She is such s good person but I can’t stop thinking about our pregnancies being so close...