Please tell me whats wrong?

Gail
I am from Philippines and i Normally having my period every 26th of the month. Then when i get here in UK my period is always changing. Its Always 5 days late. I dont know if theres something wrong or what! 
Cause last month May 6 i got my period and now its June 10 and still don't have period. I feel that my Boobs are aching and on the left side of my tummy is Aching a little bit and gone for 5min. I feel the same with this before but not pregnant and now, i'm still waiting for my period to come. 
My due date is by 13th of this month then so if still don't have
My period i will do the test.

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