Jillian Camarena-Williams, who won a shot putt bronze medal at the World Championships in 2011, has been slapped with a six-month ban after failing a drugs test, the United States Anti-Doping Agency announced Friday.

The 31-year-old American tested positive for Clomiphene during an out-of-competition test in the beginning of July.

USADA has made her suspension retroactive to the date of the test which means she will be eligible to compete again on January 1.

Clomiphene, which is considered a masking agent and is on the World Anti-Doping Agency's banned substance list, is also present in fertility drugs that help ovarian stimulation.

Camarena-Williams told anti-doping officials she was using the drug because she wanted to get pregnant.

"USADA has accepted Camarena-Williams' explanation that the Clomiphene was not being used in an effort to enhance her performance," USADA said in a statement.

Camarena-Williams told USADA she hasn't been training lately and decided to start a family in June.

"After being unable to compete due to injury, my husband and I decided to start a family," she said.