Are Rebecca's parents really Robert Bolling & Jane Rolfe?

I spent 2 hours in the library today searching through many Pocahontas and U.S. histories. I could not find any mention of Rebecca Bolling. The only "Rebecca" was Pocahontas after her Christian conversion. Robert & Jane were married in 1675, their son John was born in 1676, & then Jane died. If she had Rebecca before she was married, Jane would have only been about 14 years old. I think maybe Rebecca came from a different line of Bollings. I would love to be wrong & find out that I am descended from Pocahontas, what a story.
Shannan Fischer Kindred