Since going primal my cycle went from every 34 days to every 28 days. I also went from having a period for 7 days (3 days heavy, then gradually getting lighter for the last 4) to 5 days (with only one heavy day, and almost non-existent for the last three). I also don't have a full week of severe cramping like I used to. Just a day or two now. I have no idea if that would affect conceiving, but I don't think it would. I'm not diabetic or insulin resistant, so that can't be a reason. At least for me.