Selena Gomez has had a tough couple of days. The teen star, who is also Justin Bieber's girlfriend, was reportedly tested for blood pressure-related issues over the weekend after her overnight hospital stay, TMZ reports.

Gomez, who taped an appearance on 'The Tonight Show' last Thursday, was treated at a hospital that night after complaining of nausea and a severe headache.

She was spotted returning to the hospital on Saturday, and this time was apparently tested for blood pressure issues, a source told TMZ. However, there's been no indication as to what caused Gomez's earlier illness, but the site shoots down rumors that the star is pregnant.

Bieber took to Twitter last week, sending some public well-wishes to his lady on Friday. "#getwellselena" the teen sensation wrote.