It's not terribly uncommon for women back then to have had children by age 15. But I don't know her info since she's on my son's paternal side.
However, I pulled up her Find-a-Grave page and the oldest child listed there would have been born when she was 15, if the info is correct:
https://www.findagrave.com/memorial/6537631/katherine-royall_isham
Thank you Debbie Gambrell. Yeah, but the date given for her daughter Mary would put her at 11. Plus, I posted because everything is locked on profile.
Dig deeper, there’s good biography in the profile for Capt. Joseph Royall, Jr.
Joseph was married three times. His first wife's given name was Tomasin. She had died by 1637, when Joseph married his second wife, Ann. Joseph claimed headrights for both women, but their surnames were not listed in the patents.
I moved Mary Royall over as daughter of Thomasin Royall
There are many sites given in Joseph’s bio to try and ascertain Mary’s dates and fate.