I’m so sad :(

So I’ve been trying to have a baby with my partner for 5 years. Brother in law just told us his gf of 3 months is pregnant and they have now moved in with my mother in law. I’m just sad and hurt that I haven’t been able to give them a grand baby and all of a sudden she comes along and boom pregnant :( and now she even lives with them. I’m just hurting pretty bad right now... it sucks we can’t have a baby... it makes me feel broken.