Is Day Seven Post-Ovulation the Right Time for Implantation?

Is the seventh day after ovulation the time for implantation?

The last menstrual period was from January 7 to January 13.
On the third day of menstruation, ovulation medication was taken for five days.
Starting on January 19, progesterone was taken sublingually before bedtime.
The basal body temperatures recorded were as follows: January 7 - 36.091, January 8 - 36.121, January 9 - 36.091, January 10 - 36.121, January 11 - 36.021, January 12 - 36.251, January 13 - 36.021, January 14 - 35.961, January 16 - 36.091, January 17 - 36.281, January 18 - 36.09 (two equally dark lines on the ovulation test at 9 PM).
On January 19 - 36.09 (the second line on the test became slightly lighter at midnight, not very noticeable; in the morning at 9 AM, a transvaginal ultrasound showed ovulation).
January 20 - 36.08, January 21 - 36.67, January 22 - 36.48, January 23 - 36.61, January 24 - 36.61, January 25 - 36.41 (temperature dropped).
January 26 - 36.64, January 27 - 36.61.
First question: Is it possible that January 25 was implantation?
Second question: If the temperature does not rise after implantation, does that mean there is no pregnancy?
Third question: Can taking progesterone before bedtime cause dizziness and nausea during the day? Thank you, doctor, for your response.

Ting, 20~29 year old female. Ask Date: 2024/01/27

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, elevated temperatures are noticeable.
If you suspect pregnancy, it is advisable to monitor your condition.
Taking progesterone before bedtime should be acceptable.
Wishing you good health.

Reply Date: 2024/01/27

More Info

When it comes to understanding the timing of implantation and the effects of hormonal medications like progesterone, it's essential to consider the biological processes involved in the menstrual cycle and pregnancy.

1. Timing of Implantation:
Implantation typically occurs about 6 to 10 days after ovulation. If you ovulated around January 19, as indicated by your ovulation test and ultrasound, implantation could occur between January 25 and January 29. Therefore, the date of January 25 could indeed be a potential time for implantation. However, it's important to note that not every ovulation results in a pregnancy, and even when implantation occurs, it does not guarantee that pregnancy will be maintained.

2. Basal Body Temperature (BBT) and Pregnancy:
Your BBT readings show a slight fluctuation, which is normal. After ovulation, progesterone levels rise, typically causing a slight increase in BBT. If implantation occurs, you might expect to see a sustained elevation in BBT. However, it's not uncommon for BBT to fluctuate or even dip slightly after implantation. A drop in temperature does not definitively indicate that pregnancy has not occurred. Many women experience variations in their BBT during early pregnancy, and some may even see a dip around the time of implantation.

3. Side Effects of Progesterone:
Taking progesterone, especially in the form of sublingual tablets, can lead to side effects such as dizziness, nausea, and fatigue. These symptoms are common as your body adjusts to the hormonal changes. If you are experiencing significant discomfort or if these symptoms persist, it is advisable to consult your healthcare provider. They can assess whether the dosage or method of administration needs to be adjusted.

Conclusion:
In summary, January 25 could potentially be a day of implantation based on your ovulation timeline. However, the absence of a significant rise in BBT does not rule out pregnancy. Hormonal medications like progesterone can cause side effects, and it's important to monitor how you feel and communicate any concerns with your healthcare provider. If you suspect you might be pregnant, consider taking a home pregnancy test a few days after your expected period for the most accurate result. Always consult with your healthcare provider for personalized advice and guidance based on your specific situation.

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