Hello dear Understand your concern Yeast infection does not cause late period. There is some another reasons. Following are the causes of late period. Pregnancy is the most common cause of late period in sexually active women. You should check by urinary HCG kit/blood HCG level/USG. Following are the reason for late periods with bloating: 1. High level of stress 2. Change in life style 3. Late ovulation 4. Excessive exercise 5. Drugs: Birth control pills, tyroid medication, Excessive tea and caffeine 6. Thyroid problem 7. Hormonal imbalane: For pain: Take tablet Meftal Spas Two times a day for 3-4 days. Do regular walking and exercise. Eat healthy diet Also note that Menstruation required co ordinate action of various hormone that secreted by ovary (estrogen and progesterone) and brain (FSH and LH). If any above hormone is decreased or increased there is imbalance in menstruation. So please do full hormonal profile : Estrogen, progestron, LH, FSH, HCG and thyroid hormone. That help to diagnose hormonal imbalance. After confirmation you can take treatment according So please go ahead. Following are the cause of yeast infection: Sexual transmitted (oral, vaginal and anal sex), poor hygiene, immuno suppression After infection symptoms occur with in 2-14 days. For diagnosis you have to consult doctor and do testing for other STDs: 1. Gram stain and culture 2. PCR and nucleic acid amplification test:swab should be taken from urethra Take following advice 1. Drugs: Tablet Metronidazole 400 mg three times a day for 3 days 2. Avoid sex till you clear from infection 3. Use safer sex practice: Use condom, Dental dams 4. Maintain hygiene after sex and urination 5. If fever: Tablet Paracetamol 500 mg BD 6. Tablet cetrizine 5 mg BD orally 7. If not resolved, do screening test for all above disease. 8. You can apply mild warm pack Hope this may help you Wish you good health Best regards Dr. Sagar