WomenÔÇÖs cycle lengths vary, and the most common cycle length is somewhere between 23 and 35 days. Certain diseases or disorders, medications (including some antidepressants, anti-nausea medications and chemotherapy), stress or being significantly underweight or overweight (measured by body fat percentage)ÔÇömay affect menstruation and ovulation.
For example, if you are stressed during the first half of your cycle, your ovulation may occur later than usual. Progesterone (the hormone dominant after ovulation) may then take longer to peak, causing certain symptoms (such as sore breasts) to occur later. Your period may then be a couple of days late (5). It's important to know that regulating an irregular menstrual cycle begins with figuring out the reason behind your symptoms or irregularity and understanding your body as this will enable you address the cause directly.