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Pregnancy tests can give false positive results in peri-menopausal women. Read more Your irregular periods after marriage could be due to a variety of factors such as: stress, travel, excessive weight loss or gain, or illness.
I would check in with your doctor to see a medical workup is necessary. Read more Means you had sex 3-5 days before, or on that date. Read more Measurements estimate the gestational age of the fetus.
Irregular cycles or cycles that are shorter than 21 days or longer than 35 make calendar prediction of ovulation unreliable.
Transvaginal ultrasound is the most reliable way to determine a pregnancy due date.
Stress, illness, and other factors can also influence the timing of ovulation.If a woman’s cycle is longer or shorter than 28 days, the predicted ovulation date is adjusted accordingly.For example, during a 24-day cycle (4 days shorter than the average), ovulation takes place on about the 10th day.Sperm can live for a few days and the egg can live about a day, so most experts suggest you try every other day or every day starting about 5 or 6 days before you expect to ovulate, up through the day of ovulation or the next day.On average, a woman with a regular 28-day cycle ovulates on about the 14th day of each cycle.