Best friend ttc #2

I've been ttc with my husband for 4 years now. With no luck. My best friend has a beautiful little girl who is about to turn 3, and we love her like our own. Recently my best friend and her boyfriend decided to try for number 2. And we wish them all the best. But constantly having to hear about it, and how she "just knows" it'll happen right away is bothering me. She knew her period would be coming roughly 2 weeks ago (they made the decision to start trying right before it was due), so when it came, she acted like she should've been pregnant already. And now all I hear about is how hard it was that she got her period and how upset they were that it didn't happen yet. And all I want to do is freak out and say "when you've been trying for 4+ years, then complain to me about it not happening". Especially since she knew her period was literally like a few days away from coming. I know this makes me sound heartless or like a bitch. But I emotionally cannot handle people complaining about not being pregnant after only a month or so. She knows my struggles. I've cried to her repeatedly over it. But somehow she still feels the need to talk to me about it. I'm sorry. I'm rambling but I had no where else to turn and I'm sorry if this makes me seem petty or bitchy.