I feel bad

One of my childhood friends lost her baby not too long ago and it broke my heart. I hadn't talked to her in years but I messaged her and told her how much we love her and are sorry for what happened. I've commented on her posts positive words of love and support. She's very open on Facebook and talks about how much they're trying to have another baby.. my husband and I just found out we're pregnant with our second baby and they will be 13 months apart. I feel awful that her situation must be incredibly hard and that it's been so easy for us to get pregnant. Even by accident. I've been avoiding announcing our pregnancy but soon we find out the gender and will have to. I just feel so heartbroken for her and can't imagine her pain. She's very open about it on social media and grieves through it. Should I be feeling this bad and how can I post about my pregnancy publicly without hurting grieving mothers?