In addition to being late, Rachel has also been experiencing pregnancy symptoms, including extreme mood swings. Lack of birth control paired with the two lovebirds' late-night celebrating has caused some concern amongst house guests.

Reilly is a former cocktail waitress from Las Vegas. She is described on "Big Brother" as being "bubbly, effervescent and adventurous." These traits are often shown after a few drinks have been consumed; indeed, Rachel has been drinking as much as "Big Brother" producers will allow.

Many house guests are concerned for the safety of the potential unborn baby, calling for producers to evict her from the house. Cameras filmed the reactions live as other house guests learned of the news.

"At the very least, she should have to take a pregnancy test," Daniele Donato said, according to OnlineBigBrother.

Fellow "Big Brother 13" player, Porsche Briggs, agrees, saying "Rachel can't drink if she pregnant. It'll be bad for TV and bad for CBS."

Shelly Moore, who is the only player with a child, agrees, saying "Rachel shouldn't be allowed to compete in the HOH competition if she's pregnant. She could fall and hurt the child."

Last week's Head of Household competition involved players running back and forth on a slip-n-slide-type ramp as soap, bubbles, foam and water poured down from the sky. Players were seen falling on their backs and stomachs multiple times, later complaining of being sore from the falls.

It's unclear whether or not CBS will allow Reilly to continue competing if she is pregnant.

The father of the potential baby, Brendon Villegas, is currently being sequestered in the Jury House. It is presumed that he is unaware about the possible conception.