Hello,
Welcome to the ehealthforum and I am really glad to help you out.
The LEEP procedure that you have gotten done is for diagnostic( for checking cervical dysplasia or to check for abnormal cells) and therapeutic (to remove any tissue that may be found to be cancerous or pre-cancerous) purposes. It is associated with certain side effects like bleeding and pain after the procedure but sudden stoppage of periods is not one of its side effects.
This delaying of periods can be due to many reasons like pregnancy, stress and anxiety, malnutrition, depression, overexercising, sudden weight loss or gain (obesity), thyroid disorders and a hormonal imbalance due to polycystic ovarian syndrome(PCOS). I would suggest that you get these causes evaluated by your gynecologist. Also, you have to repeat Pap smears every 3 to 4 months (or every 4 to 6 months) for about 2 years.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For an exact diagnosis, you are advised to consult your doctor. I sincerely hope that helps. Take care.