Thats it...I'm done

Found out today that my sister in-laws husband's brother's wife is pregnant. Sorry about the crazy family tree. It crushed me. I cried and cried. They got married a week before my husband and I. We've been trying since May and nothing. What makes things worse is we've only did the BD 12 times in the last 6 months. Every month I'm tracking and watching and all my husband has to do is IT and he's always so tired. I'm done with the whole thing. I cant take the heartbreak and disappointment every month. Sorry about the the rambling.