Insensitive friend

So my husband and I have been trying to conceive but have been unsuccessful so far. One of my really close friends has an 18 month old- she got pregnant after having unprotected sex once with her boyfriend when they were drunk- totally unexpected and not planned at all. Now she loves to tell me how she is so fertile and how she got pregnant without even trying. I have tried to speak to her about how it’s insensitive but she still goes on and on about it. I’m really not sure how to deal with it anymore.