Woman gets pregnant while pregnant

Sounds like something Xzibit would say, but apparently anything is possible these days. Arkansas Pregnant Woman Is Pregnant Again:

A pregnant woman in Arkansas surprised doctors twice over when she went in for a routine ultrasound this June.

Doctors successfully located Todd and Julia Grovenburg's growing baby girl Jillian, but then discovered another smaller baby -- what could be Jillian's younger brother -- growing beside her.

The Grovenburgs may have conceived their son Hudson a full two-and-a-half weeks after Jillian, according to statements given to KFSM-TV in Ft. Smith-Fayetteville, Ark.

Different from identical twins or fraternal twins, the Grovenburg babies would have separate due dates and are considered to be a rare medical occurrence.

I guess that kinda answers this question.