No. But for some reason, his cells are actively refusing to absorb solar energy (all he managed to do was get a tan when Doctor Light and The Ray tried to supercharge him).
At any rate, if he does get Lois pregnant, I'd say that the baby won't start absorb solar energy until it is born, making it a safe pregnancy for Lois. It'd take 6 or 7 years for the baby to show the first signs of invulnerability (as per Man of Steel), 10 to 12 for superstrength and 17 to 18 years to manifest flight (the last power to appear). And, being half-human, one can assume that the baby would be much weaker than Superman, but possibly immune to kryptonite and not as vulnerable to magic (Supes' two weaknesses).