Basal Body Temperature
Charting your basal body temperature (BBT) is simple way to begin to better understand your menstrual cycle and fertility status, as it can be used to retroactively confirm that ovulation has occurred. But, unfortunately, BBT won’t provide advanced notice of ovulation, so it isn’t much help if you are trying-to-conceive and need to plan intercourse in advance of ovulation. At best, BBT charting for several months will allow you to establish a pattern to your cycles and approximate the cycle day on which you will ovulate in the coming month, allowing you to guess at your fertile window during the current cycle. Also, the accuracy of BBT charting is greatly impacted by your sleep habits. For best results, you need to get at least 4 hours of sustained sleep each night, and you must take your BBT each morning before getting out of bed or moving around. Buyer beware: Many of the “fertility monitors” currently being sold are nothing more than a BBT thermometer with a fancy charting app. Again, these products can provide confirmation of ovulation, if temps are taken accurately, but are limited when it comes to predicting ovulation.
OvaCue Fertility Monitor vs. Transvaginal Ultrasound
Transvaginal ultrasounds allow physicians to see your ovaries, measure the size of your follicles, identify when the dominant follicle is selected, and see when the egg is released from the ovary into the fallopian tube. This procedure is the most accurate way to pinpoint your most fertile days, but it is neither convenient nor economically feasible. Read a detailed analysis of how the OvaCue stands up against the transvaginal ultrasound.