Thanks for your question and welcome to EmpowHER! Do you have a history of irregular periods? A delayed period is not a side effect listed by the manufacturers of Klion D 100. You are correct to avoid sex, as it can interfere with treatment. If your period does not come in a few more days, it may be best to contact your doctor. A doctor, or pharmacist, can also review the prescription instructions with you.
I hope this helps! Please let us know if you need further information.