Really upset by my sister in law

My husband and I have been trying to have a baby for years. It's been very difficult for us and it breaks my heart because having children is what I feel like I was meant to do. I love kids and I would love a few of my own. Well I was at a family gathering at my husband's parents house and his brothers is expecting a baby any day now pretty much. I was walking into the kitchen when I heard his brothers wife say to her mother "I don't think I want Karen (me) to visit the baby for at least a month. With her being upset about not having children of her own, who knows what she's capable of doing." This hurt me so much. I would never hurt a child ever in my life. I don't understand why she even said that. Maybe it's my hormones that have me so upset because we've finally conceived! And I'm so excited and I just wanted to tell her right then and there (but my husband and I agreed to wait until we were 16 weeks if we can so I didnt) but I can't believe she would say something like that. I have completely lost respect for her.