My periods r always regular but last2months i did workout&reduce 5kg.this month my period is 10days late.this s normal or any prob?

Maybe not: Pregnancy is the most common cause of a late or missed period. If not pregnant, other causes of a late/missed period include: excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (especially birth control pills), hormonal disorders, etc… a visit to one’s ob-gyn doctor is helpful if symptoms are persistent, recurring, or worrisome.