Patient's question:
I got my period on July 28th and was planning to get pregnant. However, I started using early ovulation test strips on August 11th to check when I would ovulate... But as of the 13th, the test strips still show that it hasn't reached the peak level... Is this because I haven't ovulated yet, or is there some other issue?Doctor's answer:
Women with regular menstrual cycles can calculate their ovulation period based on their menstrual cycle. Generally, ovulation occurs around 14 days before the next menstrual period. For example, if a woman has a 28-day menstrual cycle, her ovulation period would likely be around day 14 of her cycle. If her menstrual cycle is 40 days long, her ovulation period would likely be around day 26 of her cycle (approximately 14 days before her next period). Based on the survival times of sperm and eggs, it is most likely to conceive within one week before or after ovulation. Therefore, continuous sexual activity within one week before or after ovulation can ensure the normal combination of sperm and eggs.Measuring basal body temperature can accurately determine ovulation. Basal body temperature measurement refers to the temperature taken after 6–8 hours of sleep, without any physical activity (such as speaking, eating, or getting up). The recorded temperatures are plotted on a graph by date, forming a basal body temperature curve. After ovulation, the progesterone secreted by the ovaries stimulates the body's temperature-regulating center, causing a rise in temperature. In women with ovulation, the basal body temperature is lower in the first half of the menstrual cycle and higher in the second half (after ovulation), with a difference of about 0.5 degrees Celsius. This results in a clear upward and downward fluctuation on the basal body temperature curve (a biphasic pattern). If ovulation does not occur, the basal body temperature curve remains flat and unchanged (a monophasic pattern). Ovulation typically occurs within a few days after the temperature drops and then rises again. In some women or during certain cycles, the temperature may not drop noticeably or may not drop at all, but as long as the temperature begins to rise, it can be considered ovulation. For women with less obvious temperature changes during ovulation, tracking multiple menstrual cycles can help identify their ovulation pattern. Additionally, factors such as a cold with fever or the use of progesterone should be excluded when measuring basal body temperature.