welcome to HCM.Loestrin
24 fe is low dose 21 days OCP
.It is to be taken from D5 to D25 or after period stop for continuous 21 days on regular schedule basis. Then 7 days off and you get period in this time.
It gives protection more than 99%.
Do a Urine test for hcg
after 1 wk of missed period or do a USG pelvis to rule out underlying pathology.
Check test reports and consult with your doctor. If negative all thing,start a new pack and take regularly.
Practice safe sex
in future. Be well.