I have hashimotos (but never had any real symptoms)- have been on thyroid both pregnancies no problems - I assumed it would take me a long time to conceive with DD because my levels were low at that point but not low enough to start medication apparently - I assumed wrong got pregnant first try but then my levels went crazy and I went on thyroxine under control of endocrinologist straight away. DS I was on thyroxine and got pregnant second try. Really with thyroid issues they can be so different for different people - some people do have problems falling pregnant probably but many others don't.