I'm sorry for your loss and your hurt.
I'm trying to learn to completely and effectively repress the expression of all negative emotions-- it's something I have to do because asking my family to understand me and try to "meet me in the middle" is simply too difficult for everyone.
So, I really can't tell you how to cope with your grief, other than to say try to feel and express it in private or only in the presence of a trained mental health professional (and even then be very careful to avoid strong language, raising your voice, uncontrolled tears, et cetera).
It's sad, but in my experience, Aspies trying to talk to family about their emotions just leads to more stress and grief, not and abatement of stress and grief.
Caveat: Allow-- if you can, encourage-- them to talk about their emotions regarding the miscarriage. If they talk about feeling something (sadness, pain, et cetera), it may be appropriate for you to say that you have felt that way too, but only after they are all done (and if they still have time and interest).
It's not very nice-- in fact, it's something I have tried very hard on numerous occasions not to believe-- but my experience is that your emotions are your problem and are best kept to yourself.
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"Alas, our dried voices when we whisper together are quiet and meaningless, as wind in dry grass, or rats' feet over broken glass in our dry cellar." --TS Eliot, "The Hollow Men"