Feeling useless...

So today I found out that my sister in law is pregnant again.. I had a breakdown and couldn’t stop crying this morning because I feel like my body is useless, and I’m not meant to get pregnant. My hubby and I have been trying for almost three years and nothing. I want to be happy for them but at the same time I’m upset, angry, and sad.. My hubby told me this morning that they were expecting but he wasn’t supposed to tell me because they were going to announce it to us tonight. As soon as he said they were pregnant I started bawling, and I couldn’t stop for over four hours. I didn’t go over to their house to hear them say it because I didn’t want to have another break down.. I just got over my really bad depression a couple weeks ago and I’m put right back into with news that I should be happy about..