how I can know the exact day of the next period?!

[Queen]

Hello my dear friends

please help me,
If the last three periods were as follow
1st day:3rd NOV , last day: 7th NOV
1st day:28th NOV, last day:4th Dec
1st day: 25th Dec, last day:29th Dec

When it is supposed to come this month?
I have a period calculator application says that it supposed to come yesterday, is that true? till this moment It doesn't come.
Am I Pregnant?
yesterday I made the test , it was negative and it frustrated me.

 

[wildasthewind]

You had two periods in November? It seems like your periods are irregular and difficult to determine exact dates.