The viral load of an HIV positive woman is highest during active 
menstruation, and there is a higher risk for all sexually transmitted 
infections (STIs) when an infected woman is menstruating. If you don't 
know the status of your partner, you can reduce your risk by using a 
barrier method of protection (such as a male or female condom, dam, 
finger condom or cot, or  latex glove) consistently, whether or not a 
woman has her period.

 
