Rihanna has canceled four concert dates so far on her "Diamonds" world tour, which began March 8 in New York City.

By mid-March, the 25-year-old Barbadian singer had to cancel several stops for the American leg of her tour, including Boston, at the request of her doctor, after suffering from laryngitis.

On Thursday, she was spotted leaving a medical building in Beverly Hills, Calif., and there is now speculation that she may not have a throat infection but may actually be pregnant.

Though unexpected, it may not come as too much of a shock, as she and Chris Brown have admitted their love for one another and have been together on-and-off for a number of years.

Recently, the “Forever” singer told James Ingham of the Daily Star, “I love her and she loves me. That is what it comes down to. Our love is for life. We are meant to be together.”

There have also been rumors Rihanna and Brown are engaged since she showed off a diamond on her left ring finger last month at the Grammy Awards in Los Angeles, Calif.

A source told Perez Hilton that they're engaged and have planned a late July wedding in Rihanna's home country.

Rihanna’s father, Ronald Fenty, has sounded supportive of his daughter's relationship with Brown.

“Whatever makes her happy. I hope one day she will get married. Everyone adores Chris, he's a super guy,” Fenty said in the October issue of Life & Style magazine.

“The family loved Chris Brown before they met him. I always thought he was extremely talented. He is a good person and always gave me great respect.”