You mean “virginal conception,” i.e., the conception of Jesus by Mary, without a human father.
The “Immaculate Conception” is the conception of Mary, who had a human mother and human father, without Original Sin.
In the case of the mother of the octuplets, it's quite possible that she is still a virgin despite giving birth to 14 children, a very strange story indeed. I do hope the doctor who tansferred 8 embryos will be identified and scrutinized and that the outcome will be the establishment of strict medical standards regarding the practice of invitro and other fertility proceedures such as manditory psych and socio-economic evaluations and limits on the number of fertilized eggs transferred.