Miscarriage/venting

So back in March we lost our son. October 11th would've been my due date. Ever since the miscarriage I've been emotional, at first it was everyday then not so much. Now that the day is coming that I once couldn't wait for, I find myself becoming more and more emotional again. I cried the other day at work after seeing a woman with her newborn son. I cry over everything now. I talk about it with my husband and he gets why it's harder for me to just move on. His family however isn't the most understanding people. My sister in law just had her son a month ago and even though I know it shouldn't bother me talking about their baby it does. (They showed very little respect for my husband and I when they found out about our miscarriage and all through her pregnancy reminded us they were having a healthy baby boy.) They continued this even till now. I don't know his family just makes me feel like shit for still being sad over my baby. Am I wrong for dreading this day? Am I wrong for still being emotional over it? 😔😔