After effects of miscarriage

I feel like I am becoming bitter towards my sister whenever she complains about her morning sickness or when she went and got the ultrasound that I was supposed to get... On Sunday it will be 4 weeks since my miscarriage and it seems like it is getting harder and harder and not easier... I was just wondering if it was like this with anybody else after they had their miscarriage while someone close to them was also pregnant.