A Dutch lab has egg on its face after a major screw-up may have left 26 women fertilized by sperm cells from the wrong man.

Officials at the University Medical Centre in Utrecht, Netherlands, chalked the potentially disastrous IVF mishap up to a “procedural error” between mid-April 2015 and mid-November 2016.

“As a result, sperm cells from another couple being treated may have been involved in the fertilization of the ovaries of 26 couples,” the medical institution said in a statement.

“In these cases, there is a chance that the ova have been fertilized by sperm cells from a man other than the intended father.”

The medical center described the chance of the error as “small,” but the reality of the issue “cannot be ruled out.”

All of the couples were notified and half of the women who underwent the IVF treatment have either become pregnant or already gave birth.

The University Medical Centre said it immediately started an investigation to find out how the possible mix-up came about.

The supervisory board for the medical center said it “regrets having to burden the couples involved with this news and everything will be done to provide clarity for everyone as soon as possible.”