I m 19 yrs old i had intercourse 2 months back had periods good last month this month my periods are 24 days late and they came on 55th day of my cycle?

Late menstruation ?: If your menstrual history has been regular (24-32 days apart) and pregnancy is possible, obtain a serum HCG test to be certain about pregnancy. Stress (emotional, school, work, etc) can cause a delay in ovulation, which will prevent the onset of menstruation. Check with your gyn physician if the HCG test is negative, who may recommend oral bcp's.