Before DD my cycles were all a mess (hence the IUIs) but the only time I was longer than 45 days it was because I was pregnant (my only non-medicated pregnancy, ended in a m/c). When I was looking at my dates last week I realized I was at 47 days. I have no other symptoms really. Except reduced milk output.
I definitely wouldn't worry about exercising or sushi. And there pretty much would be no babies if only people took their vitamins and didn't drink had them;)