Miscarriage due date soon.

Earlier this year I was surprised by the anniversary of my miscarriage not bothering me. I was proud!
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But now the anniversary of my due date is coming in a month and I've started to be rather sad. I don't think it helps that my niece is here from Virginia and my husbands grandparents are ogling over her (as grandparents should) and it just really saddens me to think that they don't know that it wasn't their first great-grandkid.
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We were waiting until marriage and slipped up (now I know) not long after my husband bought the ring to propose. The week after he proposed we found out we were pregnant and miscarried at 11 weeks once we started getting excited and thinking how to break the news to family.
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It's not like I'm mad at my niece, but it's a constant reminder right now that I'd have a toddler 1 year older than her and they could have been playing together.
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I guess miscarriage anniversary is mourning what happened, due date anniversary is mourning what could have been.