Jealousy

My dh and I have been ttc for over a year now. We found out in Jan that my dh brother and his wife are pregnant after their first month of ttc. It has tore me up. I threw the gender reveal trying to be a good sport about it and because I love throwing parties. My sil was such a brat about the whole thing, expecting more and more. It's just made my jealousy worse. She's due next month and invited us to the 4d ultrasound next week. Over the phone, I excitedly said of course I'd be there. As soon as we got off the phone I started having anxiety about it. I'm happy for them and excited to be an aunt for the first time. But I can't help but feel sad for myself. It seems everyone around me can get pregnant no problem, including my father and his gf. We were just diagnosed with male factor infertility. I hate feeling like "poor me" and dealing with the jealousy. It seems like my turn will never come.