I just want to rant a little...

So my sister in law is pregnant and she talks about it all the time. Which most the time I don't care but there are times when I just get so jelous and sad knowing that I'm not. They weren't even trying and got pregnant...and what makes it worse is we live together!! I just really don't know what to do bc I have no one to talk to. I mean I have my bf but he just doesn't understand how I feel. He knows kinda how I'm feeling but he doesn't know exactly how it affects me. When we found out she was pregnant I just went to my room and cried... And he did comfort me and told me that it'll happen when it happens. But he doesn't know that it will...i don't even know I can get pregnant, that's what I'm most concerned about!! I really just need someone to talk to bc it's hard you know and its depressing. Am I the only one feeling this way!?!😢😭💔