Hurt, jealous and sad

So my husband and I are in NC for Thanksgiving with my family and my little brother and my SIL just announced to us last night that they are pregnant. This will be the first grandchild for my parents. My husband and I have been ttc baby #1 for 16 months. It hurts so bad and I have had to excuse myself to the bathroom multiple times to cry. My husband knows how much this hurts but the worst part is seeing all my family watch me as I found out the news to see how I would react. I want so badly to be a mother and I just keep getting let down. How am I supposed to deal with this jealousy and pain while celebrating the holiday? Please help. 😢