2 DAYS LATE

Patricia • I`m 23, have a beautiful 6 yr old daughter and a wonderful man in our life`s.
Okay so a few months prior I was early two days. But since then my period has came right on time with a 28 day cycle. However this month today makes two days late. I had period like cramps happen two days prior to my regular period date. Should I wait or go ahead and test. Normally I get crampy the day right before I start. What could cause this?