I ovulated on the 10th dec, am 30 day cycle. i was suppose to start my period on the 25th its the 27th still nothing. though ive mild cramps what could possibly be the reason? ive been on point with the start of my periods until now.

Depends: If you had sex since your last period, you may do a home pregnancy test. If the result is negative repeat the test 4-5 days later unless you get a period by then. Use first morning urine and follow the instructions carefully. Visit this site for info: http://www.nichd.nih.gov/health/topics/menstruation/conditioninfo/Pages/causes.aspx Wish you good health!