Period late, negative test

Breezey13

Hey ladies! My period was due Christmas day and has yet to come. Usually by day 27 I start spotting and I'm almost through day 29 now. I tested with 3 different brands on Dec 22, 24, and today and all have been negative. Could I be pregnant? I have had cramps for about 4 days, thinking my period was starting. Anyone else have a similar situation and get a positive eventually??