The former Big Brother star announced that she is expecting her first child with boyfriend Adam Horsley at the weekend, saying that the news has "transformed her life".
Thomas has today (August 7) taken to Twitter to express her gratitude after undergoing an ultrasound, to check on what her representative described as a "small amount of clotting", and confirm the baby's good health.
"Thank u to the fabulous doctor and midwife this morning," she wrote. "Had such a fright but all is ok now and baby seems fine :-) x."
Thomas is due to give birth in January. She has been dating Horsley, a city trader, for just ten months.
The reality TV personality hit headlines last year after footballer Ryan Giggs sought protection against reports of their extramarital affair with an anonymity injunction.
The Manchester United star was later exposed on social networking sites and by MP John Hemming, while Thomas was cleared of allegations she had blackmailed him.