Guilt?

My husband and I (both 25) have been ttc for a little over a year. I have pcos and Graves’ disease and it has proven to be very difficult for us. About a month ago we found out my sister (21 yo) was pregnant and today we had the gender reveal. I am over the moon happy for her and her partner and had many happy tears at the reveal today. Lots of her mom’s family was there and many people I’ve never met. People kept prying and asking why we hadn’t had a baby yet and when it was gonna be our turn and I got really overwhelmed. After the reveal my husband and I decided to leave and I cried the whole way home. I am so thrilled for them but at the same time I’m so sad it’s not me. I feel guilty for feeling that way. I just needed to vent to people that might understand. Am I wrong for feeling this way?