@duewithpu2 I haven't had them in over a week but for a month or more before I was having them semi regularly. Nothing major but I only would feel them when I finally was quiet and still in the evening after the kids were in bed. Don't think they were from over exertion though but can't say for sure. I also take thyroid meds so that could be a factor for me.
@cmdesigner If you want/have only one everyone comments about how you should have another (I'm an only child too and get annoyed, like my life was empty because of it???). If you want/have three or more people think you are nuts. It's two kids or you are forever dealing with comments :-p