The study objective is to collect data to assess the accuracy and reliability of Earlysense fertility cycle monitoring performance vs. acceptable known reference methods such as blood tests and intra-vaginal Ultrasound currently used as validated methods to detect ovulation and pregnancy. In addition the collected data will be used to further enhance and improve the existing algorithms.

The study objective is to assess the accuracy and reliability of Earlysense cycle monitoring to detect ovulation and implantation vs. acceptable known reference methods including blood tests and Ultrasound examination that are currently used as validated methods to detect ovulation and pregnancy. In addition the collected data will be used to further enhance and improve the existing algorithms that detect menses.

Inclusion Criteria:

1. Age 18 years ≤ 40 years
2. Healthy women with no significant background illness or Consenting women that arrive to IVF clinic for frozen embryo transfer on spontaneous cycle, or Consenting women that arrive for cycle evaluation or insemination on spontaneous cycle (infertile women).
3. Healthy women volunteers with regular menstrual cycles - not using contraceptives
4. Is willing to sign the consent form.
5. Sleeps on a mattress which allows placing a sensor under that mattress(so Earlysense sensor can be inserted under the mattress)
6. Regular cycle

Exclusion Criteria:

• Age < 18 years or > 40 years old
• Is not willing to sign the consent form.
• Does not sleep on a mattress that allows placing EarlySense sensor under it .(e.g., Futon0 Taking any significant medication or have major chronic diseases: e.g. Diabetes, CHF, COPD, Heart disease or pacemaker
• Taking pills (oral contraceptives or medical IUD w. progesterone)
• Women with irregular cycles (PCOS) or un-ovulation