Sis in law pregnant

I had my forst miscarriage and then my sis in law got pregnant and carried her baby full term then I got pregnant with twins and miscarried them as well less than one month later find out I am pregnant with a singleton and my sis in law is pregnant with twins. I pray everything goes good for both her and I but why do I feel like she has 3 of my babies and my 4 r not here idk how to feel I am very excited that I am almost 12 weeks pregnant but at the same time when I think of her being pregnant with twins I also relate them to mine. If u have any help for me please do cause I hate feeling this way