Khloe Kardashian got herself tested for a whole range of sexually transmitted diseases, or STDs, several months ago as soon as she first began suspecting her husband, Lamar Odom, was cheating on her, a Radar Online report claimed on Thursday.

A source aware of Kardashian’s marital problems told the website that the “Keeping Up With The Kardashians” star “was physically sick to her stomach when Lamar admitted that not only had he cheated on her, but didn’t use protection 100 percent of the time.”

This forced Kardashian to undergo a wide range of tests, and according to reports, the results were negative.  

Reportedly, Kardashian had employed the help of a private investigator who found that Odom had been with five women in the past one year. Among them, three women -- Polina Polonsky, Jennifer Richardson and Sandy Schultz -- have come out in public saying they had slept with the former Los Angeles Clippers player.

“Lamar refused to admit to how many women it was, but Khloe knew it was at least five different women in the past year,” the source said. The private investigator not only gave her photographic evidence of Odom with these women, but also copies of text messages that he sent to them.

“She is a very smart woman and knew she had to get the proof because of the infidelity clause in their prenup,” the source added.

This news comes just days after a Celeb Dirty Laundry report noted that Kardashian might have faked her pregnancy plight on “Keeping Up With The Kardashians.” Kardashian’s attempts to get pregnant were well-documented on the reality show, and speculations were rife that the youngest Kardashian sister was battling infertility issues.   

But, the Radar Online source quashed the rumors saying that Kardashian “recognized that there was no way she could have a baby with Lamar at this point in their marriage. She can’t trust him, and refuses to bring an innocent life into the world under these circumstances.”