Hello Thanks for writing to us with your health concern. There could be various reasons for a missed period. If you have irregular cycles, you should first repeat the pregnancy test. Anxiety, stress, emotional turbulence, weight gain or loss, late nights, erratic food habits, travelling, change in climate or altitude , ingestion of hormonal medications or medications that affect the hormonal axis - all these are potential reasons. It is not alright to take Primolut by yourself without a thorough evaluation. Firstly, visit a gynecologist. Have a detailed internal check up - per vaginum and per speculum. Also, hormonal tests - FSH, LH, TSH, Prolactin, OGTT, DHEAS, free testosterone, Lipid profile. Also get a pelvic ultrasound scan done transvaginally. This will reveal a diagnosis. If the workup is negative, and the only cause is temporary hormonal imbalance, taking Primolut will correct the problem. Conditions such as PCOS - polycystic ovarian syndrome and endometrial hyperlasia need to be ruled out. All the best Take care.