Hello, The function of the progesterone which is released by the ovary after ovulation is to prepare the bed for the fetus in the uterus (endometrial lining of the uterus). Because of this Infertility or miscarriage are the complication of low progesterone. It may produce lot of other symptoms. Primolut N is oral progesterone. Progesterone creams, gels, vaginal suppositories or shots are also available. These are given right after ovulation, so that progesterone levels rise to normal and facilitate the preparation of the uterine lining for pregnancy. Primolut N can also be given in Endometriosis, Menstrual disorders such as painful periods (dysmenorrhea), heavy menstrual bleeding (menorrhagia), irregular periods, continuous, heavy menstrual bleeding or premenstrual syndrome and Delaying menstrual bleeding. So the drug is administered only after ovulation when you plan for pregnancy. From the above indication you can understand that Primolut N is not used as a contraceptive pill as lots of other safe combined contraceptive pills are available I think with this you can understand what is low Progesterone, indication and route of administration. Now consult with your Dr and follow her advise - after proper investigations Best wishes