So far, the Barbadian singer has not come with clarifications about the speculation.
Pregnancy rumors emerged when the 25-year-old singer was spotted leaving a medical clinic in Beverly Hills on Tuesday.
Rihanna also had to cancel her concerts, in Houston, Tex. and Dallas, Tex. (April 15-16) due to an illness.
But multiple sources close to the singer denied that Rihanna is pregnant for E! News.
Until an official statement, this speculation should be taken with a grain of salt.