Has anyone experienced this then found out they were pregnant?

I never had it in my 1st and 2nd pregnancies but did in my 3rd. It was a weird pulling tugging pain really low in my abdomen and it started the day my period was due and continued for about a week and was usually when I moved. I've found out since that it was the ligaments stretching and thickening getting ready for baby. I really hope thats what you've got....fingers crossed xx