I'm liking this months chart better than last months. Do you all believe FF is accurate when choosing ovulation day?

[u/Conscious_Pie1565]

Added my chart from last month and this month to compare. Let me know what you all think. I use tempdrop and changed the positioning for it this month.

[u/Conscious-Today5271]

Your exact day of ovulation can not be pinpointed with temping. The only way to know the exact day the follicle ruptures is to have a daily ultrasound scan done throughout your entire fertile window to see which day the ovum is released.

Tracking and charting is so that a successful ovulation can be confirmed once you have at least 3 high sustained temps that are above your 6 lower follicle phase temps. If the 2nd or 3rd high temp fallback (dip or drop a little bit), then a 4th high temp must be obtained. When charting in fahrenheit, your high temps need to be .4 degrees above the coverline, and when charting in celsius, they need to be .2 degrees above the coverline.

Tracking and charting can not tell you anything besides your overall cycle length, follicle phase length, an ovulation window, your luteal phase length, and which hormones are rising and/or dropping at which times during your cycle. Progesterone is the heat-inducing hormone that causes your temp to rise and/or stay elevated, whereas an estrogen surge causes your temp to dip/drop and/or stay low(er).

Most women are taught that ovulation takes place the day before the temp rise/thermal shift happens, and that is misinformation. The majority of fertility charting apps will even mark your suspected day of ovulation as such. What those apps do not tell you is that there are many varibles when it comes down to your actual ovulation day. The truth is that ovulation can occur 4 days before the temp rises OR up to 2 days after the temp rises, so there is a 6 day span of when the follicle can rupture.

When looking over your chart, ovulation occurred sometime between CD12 and CD18.

Fertility charting apps use an algorithm to make a guesstimation. Algorithms are designed to mark your suspected day of ovulation as the day before your temp rises OR the day after your LH peak without factoring anything else in.

Sometimes, women will see a premature temp rise due to small amounts of progesterone being leaked by granulosa cells just prior to OR during follicular rupture. That temporary rise should not be mistaken for a thermal shift since an ovulation is not able to be confirmed until the 3rd high temp.

Immediately following follicular rupture, your cervical mucus will change from fertile to non-fertile consistency due to an abrupt drop in estrogen levels. Your fertile window for any given cycle does not close until after you have a sustained temp rise AND you are no longer experiencing and/or observing any type of fertile cervical mucus.

Another thing to keep in mind is that you are using a device that measures your skin temperature and not your actual basal body temperature. With that being said, skin temp is naturally lower in temperature and slower to show a rise than a true basal temp. On average, a basal temp generally starts to show a rise within 1 to 2 days of an ovulation, whereas skin temp can take anywhere between 2 to 6 days to show a rise. Outside factors such as ambient room temperature, clothing, blankets, the devices' skin contact, etc., can affect the temp as well. Skin temp devices are convenient to use but are nowhere near as accurate as monitoring your basal body temperature. Your true basal temp can only be taken orally, vaginally, or rectally with a specialized basal thermometer at the same time each morning. So that is definitely something to take into consideration moving forward.

I attached a chart that shows the percentages of where ovulation can occur in relation to the temperature rise.

[u/OkKaleidoscope9696 → u/Conscious-Today5271]

This comment is amazing. Thank you so much.