7 Reasons for Late Periods: , 1. Stress Stress can cause a delay in a womans menstrual cycle by disrupting the balance of hormones in the body. The hormone cortisol, which is produced in response Can Periods Be Delayed Intentionally? Yes, they can. The most commonly used medications are progesterone based hormones, such as: Norethisterone Medroxyprogesterone acetate These are usually started 35 days before the expected date Molecular mechanisms underlying cyclophosphamide induced ovarian injury and protective strategies Naunyn Schmiedeberg's Archives of Pharmacology Springer Nature Link Variability of glutathione during the menstrual cycledue to estrogen effects on hepatocytes? ScienceDirect