:) :) Don't worry, you're safe! There is little reason to fear that sharks are very sensitive to the smell of blood and that if we swim while on their period, they will smell it and grab a bite from our butt. There is no record of a shark attack on a menstrual swimmer in the world. On the contrary, there are countless examples where many people who dive during their period have completed their dives safely. Yes, sharks' sense of smell is extraordinarily powerful. With these abilities, they can smell their prey hundreds of meters away. However, relying on science and data is always a logical decision. There is no evidence of a correlation between menstruation and shark attack. :)