Nobody's Baby But Mine is a romance novel written by Susan Elizabeth Phillips and published in 1997.

Physics professor Jane Darlington decides on her 34th birthday that the time has come to have the baby that she's always wanted, even though there's no man in her life.

As she doesn't want to use a sperm bank, she settles on famous Chicago Stars quarterback Cal Bonner.

After tricking Cal into believing she is a prostitute, Jane manages to become pregnant, at the second attempt, with help from a sabotaged condom.

[1] Susan Elizabeth Phillips has published other books featuring heroes from the Chicago Stars team.