Could Mariana (Cierra Ramirez) be pregnant on “The Fosters”? That’s the latest drama to hit the ABC Family series.

Fans know that Mariana wanted to have sex with her boyfriend, Mat (Jordan Rodrigues) before he went on tour for a couple weeks over the summer. However, Mat wasn’t on the same page as his girlfriend. He turned her down, explaining that he had to leave and that the timing was off. Emotional after Mat’s departure, Mariana had a couple drinks with Callie’s (Maia Mitchell) ex-boyfriend, Wyatt (Alex Saxon), and lost her virginity to him. The teen has been stressing out ever since, and for good reason … because she might be pregnant with Wyatt’s baby. 

In a sneak peek video from episode 5, Stef (Teri Polo) is cleaning up a broken trash bag when she finds an empty pregnancy test box. Needless to say, Stef is shocked to find the box -- but she doesn’t know who it belongs to … or what the results are.

In a second sneak peek video posted by TVLine, Stef and Lena (Sherri Saum) discuss the situation. And while fans of “The Fosters” know that Mariana has been worried about being pregnant, the two moms believe that it’s Callie who took the test.

“What am I going to say?” Lena asks Stef after she fails to reach Callie on her cell phone. “Hey Callie, it’s mom, just checking to see if you’re pregnant. Give us a call.” [Click HERE to watch the video on TVLine.]

What Stef and Lena don’t know is that Callie is off on a spontaneous trip with Brandon (David Lambert) after he got kicked out of music camp for plagiarizing. The drama will play out when episode 5 of “The Fosters” airs on ABC Family on Monday, July 6 at 8 p.m. EDT.