This is part of a study of a new technique that could improve the success rate of in vitro fertilization.
It's called CGH. It's a new way of screening eggs and embryos for genetic defects to increase the odds a woman achieves a healthy pregnancy from IVF.
Scientists say two out of every three embryos implanted by doctors into a woman's womb during IVF fail to develop into a pregnancy, often because of abnormalities.
Larger trials are now planned.
The new CGH is most likely to be used to help women over the age of 37 who undergo IVF or those with a history of miscarriage or unsuccessful IVF treatments.