I have a 33 day cycle which is usually on time every month...except this month. It is now 8 days late. I took a test last Saturday in the late afternoon and the test was negative so I expected my period to come on later. However, this week I am having slight cramping, tender breast, and mood swings. Is there a difference in period cramps and pregnancy cramps? I cramped my last pregnancy but I had a positive test during week 4.