Clearblue Advanced Fertility Monitor Consumer One Cycle at Home Study

- Female

- Aged 18 - 45 years

- Willing to provide written informed consent to participate in the study and comply to the investigational procedures

- Naive to similar marketed products including current Clearblue fertility monitor and Persona

- Two natural cycles immediately prior to entering the study, each lasting between 21 and 42 days

- Seeking to become pregnant

- Unwilling to provide written informed consent to participate in the study or comply with study procedures

- Employees of SPD, Proctor & Gamble or Alere

- Have a condition that is known to be contra-indicated in pregnancy

- Usually have menstrual cycles which are shorter than 21 days or longer than 42 days

- Using or have used in their last 2 cycles, hormonal contraceptives including oral, emergency oral, implants, patches, transdermal injections, vaginal ring and progesterone intrauterine systems (IUS)

- Using or have used in the last 2 cycles, infertility medications or hormone replacement therapy containing hCG or LH

- Taking clomiphene citrate or other ovulation induction drugs

- Are using any treatment which may affect the menstrual cycle

- Have recently been pregnant, miscarried or breastfeeding

- Have been diagnosed with polycystic ovarian syndrome (PCOS)

- Are peri- or post-menopausal e.g. experiencing symptoms such as irregular menstrual periods, hot flushes, night sweats, sleep disturbances and mood swings

- Are taking antibiotics containing tetracyclines

- Have impaired liver or kidney function

- Have previously participated in a SPD 'trying to conceive' study