Conception Chances and Implantation Timing During Pregnancy

Pregnancy probability

Hello Doctor, I am currently in my seventh week of pregnancy.
During my visit, the doctor mentioned that implantation likely occurred around late September to early October.
I would like to ask about the likelihood of conception on September 23rd, when I had intercourse without a condom for the first few thrusts (less than a minute) but used a condom for the rest until ejaculation.
On September 25th, there was no contraception used at all.
Which day has a higher probability of conception? Additionally, could you please tell me how long it typically takes from fertilization to implantation? Thank you, Doctor!

Xinxin, 10~19 year old female. Ask Date: 2018/11/02

Dr. Huang Jianzhong reply Obstetrics and Gynecology

Currently in the seventh week of pregnancy, during my doctor's visit, the doctor mentioned that implantation likely occurred around late September to early October.
I would like to ask, on 9/23, we had intercourse where the initial thrusts were without a condom and no ejaculation (less than a minute), but afterwards, we used a condom until ejaculation.
On 9/25, there was no contraception at all.
Doctor, which day has a higher probability of conception? Answer: The probability of conception is higher on 9/25.
Additionally, I would like to ask how long it typically takes from fertilization to implantation? How many days? Answer: The time from fertilization to implantation is approximately 7 days.

Reply Date: 2018/11/02

More Info

Understanding conception chances and the timing of implantation during pregnancy is a crucial aspect of reproductive health. Based on your question, it seems you are currently in your seventh week of pregnancy and are trying to clarify the timeline of conception and implantation.

To begin with, let's discuss the process of conception. Conception occurs when a sperm fertilizes an egg, typically within the fallopian tubes. After fertilization, the fertilized egg, now called a zygote, begins its journey toward the uterus. This journey usually takes about 5 to 7 days. During this time, the zygote undergoes several divisions and transforms into a blastocyst. Once it reaches the uterus, the blastocyst will implant into the uterine lining, which is essential for establishing a pregnancy.

Regarding your specific situation, if you had unprotected intercourse on September 25, this is likely the date that carries the highest chance of conception, especially since you mentioned that you did not use protection during that encounter. The risk of pregnancy from the earlier encounters on September 23, where there was no ejaculation, is significantly lower, but not entirely negligible due to the possibility of pre-ejaculate fluid containing sperm. However, the likelihood of conception is much higher with unprotected intercourse where ejaculation occurs, as sperm can survive in the female reproductive tract for up to five days.

Now, concerning the timing of implantation, it typically occurs about 6 to 10 days after fertilization. This means that if fertilization happened shortly after your unprotected intercourse on September 25, implantation would likely occur around early October. Your doctor’s estimate of implantation around late September to early October aligns with this timeline.

In summary, the chances of conception are highest with the unprotected intercourse on September 25, and implantation generally occurs about 6 to 10 days after fertilization. If you have further concerns about your pregnancy or any symptoms you may be experiencing, it is always best to consult with your healthcare provider for personalized advice and care.

Additionally, it is important to maintain regular prenatal check-ups to monitor the health of both you and your developing baby. Early prenatal care can help address any potential issues and provide you with the necessary support throughout your pregnancy. If you have any more questions or need clarification on any aspect of your pregnancy, do not hesitate to reach out to your healthcare provider. They are there to help guide you through this exciting yet sometimes confusing time.

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