How to deal with other people’s pregnancy’s

We’ve been TTC for almost a year now and my sister just announced she was pregnant. I’m so happy for her I swear cause I know she will make an amazing mommy. It just hurts! How is it so easy for some people. She and her husband literally just moved in together and she was pregnant after the first month. Me and my fiancé have been trying for forever I feel like. I just don’t know how to feel. I don’t want to be jealous I’m just... idk. I just need some words of encouragement. I can’t stop crying! I just want my own little precious baby... oh well I guess that’s what aunts are for. 💔💔