I'm so sorry about your miscarriage. My first pregnancy ended in loss, and it really blindsided me.
I took the Enterolab stool test after I had both of my kids, and it was positive, but of course that's not an official celiac diagnosis. However, after all the reading I've done about how gluten may trigger a lesser immune response in most
people, I have no desire to eat gluten, so I probably won't ever seek an official diagnosis. (FYI, example here
and blog postings here
I had already had both of my children (both girls) before I got tested. There is a history of ASD in my family, but neither of my kids are on the spectrum. There's also significant autoimmune disease in my family (Type I diabetes, CD, lupus).
My older daughter does have very mild sensory issues (almost never noticeable now at age 6), and my younger daughter has significant food intolerances. We have no specific reason to think she has CD, because she doesn't carry the "official" alleles, but she is off gluten, dairy, and soy anyway.
I didn't start having symptoms until after I'd had my first. I had no trouble getting pregnant either time, though I did have a partial molar pregnancy before my first baby, and one miscarriage after my first baby. I was breastfeeding when I had the miscarriage, and I have a feeling that lactation-induced subfertility played a role there. Not that bf'ing caused the m/c, but that bf'ing resulted in a less robust ovulation. In both cases I waited 4 months before TTC again, and conceived within two cycles. Since I hadn't yet been tested, I was not gluten free during either pregnancy.
Wishing you peace and clarity!