Mann's group, for the 2010 work on ART and epigenetics, used mice to examine changes on four genes following a superovulation procedure.

This tells her whether she has ovulated, based on any rise in her basal body temperature that the patch has noticed. However, DuoFertility can do more than just record the moment of ovulation.

In addition to changes in looks and smells, Bryant and colleagues have measured a subtle but detectable shift upwards in the pitch of a woman's voice when she's approaching ovulation.