We make different absorbency levels for every day of your period. Try to use a tampon with the minimum absorbency needed to control menstrual flow. You might want to start by choosing the smallest size--o.b.® Regular--and then switching to a larger size if it’s necessary.
The graph below shows a typical woman’s flow pattern during her period. Generally menstrual flow is heaviest during the first 3 days. You may want to use a higher absorbency tampon on your heavy days and a lower absorbency tampon on your lighter days. No matter which absorbency level you choose, remember not to leave a tampon in for longer than 8 hours
New onset of heavy menstrual bleeding or abnormal flow patterns may be a sign of something more serious. If you see a significant increase in menstrual flow or change from what is normal for you, please talk to your doctor.