Didn't know Celiac was a possibility

[MMEZ]

I went in for a routine check up required by my employer. Everything was going well until he reviewed my labs from my OB/Gyn appointment last month and started asking me about my newly diagnosed case of anemia. I told him I was taking iron as I have extremely heavy periods. He decided that he wanted to order some more labs just to check my iron levels again. He also wanted to check thyroid levels as well.

Today, I get a phone call from his nurse saying that they tested for Celiac and it came back as positive for the diesease. For one, I didn't know we were even considering celiac as a potential issue. For two, while I may have a few Of the symptoms (like fatigue - but who isn't tired when they are working 50-60 hour work weeks, raising 2 kids and training for a 7 day bike race), but all my other lab values are normal (with the exception of the ferritin level).

I don't get an upset stomach based on what I've eaten; no GI issues; nothing that really screams celiac. How often is this misdiagnosed and is it possible to have even if all my other lab values are good? So confused! My only issue is with the heavy periods, but if being on iron is going to help that, where did the possibility of celiac come into play??