Jennifer Lee Riojas (PICTURE): Is Texas Teacher Pregnant with Student's Child?

FORT WORTH, Texas (CBS/AP) Jennifer Riojas, a Fort Worth teacher accused of having sex with a 16-year-old student, may be pregnant with the teen's child, according to one report.

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Police took Riojas into custody on Wednesday. The 25-year-old taught 9th grade science at Carter-Riverside High School before resigning last month.

The student told police their encounters took place in motels around North Richland Hills and once even in a hospital bed, where the student was recovering from a football injury, reports CBS affiliate KTVT.

According to local station WFAA, investigators said the teenage victim came forward last month because he feared he could be the father of Riojas' unborn child. The baby's paternity has not been established.

The warrant alleges that Riojas drove the sophomore student to "different hotels located by N.E. Mall in the Mid-Cities" for the purpose of having sexual intercourse in December and January.

Students who knew both the teacher and the alleged victim told KTVT that they noticed the pair spending an unusual amount of time together.

"In my last year of class he would walk in and talk to her a lot," former student Micheal Webb told the station. "I never really knew anything was going on though at all."

A police affidavit says the teacher attended the boy's athletic events, and they would spend time together during lunch period.

Riojas is charged with sexual assault of a child. Bond was set at $20,000.