Common "Conception Date" queries answered by top doctors | iCliniq

Conception Date

The conception date is when the baby gets conceived in the womb of the mother. Conception can occur after 11 to 21 days of the first day of the last menstrual period in women with regular menstrual cycles. In other cases, ultrasounds can help to diagnose the appropriate gestational age of the baby. It can be taken from four to five weeks of the last menstrual period to diagnose the gestational age.

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My LMP and ultrasound differ by two days. Why?

Query: Hi doctor, According to my LMP, I was 9 weeks and 5 days pregnant, and ultrasound showed I was 9 weeks and 3 days pregnant. There was a CRL measurement of 26.96 mm. I had sex on the last day of my periods and then again after 11 days. And, my LMP and ultrasound calculation show two days difference. ...  Read Full »


Dr. Kamalpreet Kaur Nagpal

Answer: Hi, Welcome to icliniq.com. Your estimation is correct. There is the least possibility of conceiving on the last day of the period. You must have conceived around the second event. Now, LMP (last menstrual period) and ultrasound time cannot match exactly. Although in your case, it is almost th...  Read Full »

I am a 29-year-old woman unable to conceive despite having intercourse during my fertile days. Please help.

Query: Hi doctor, I am 29 years old and trying to conceive. I tracked my ovulation, and we had intercourse four times during the fertile window. My period is now six days late, but my pregnancy tests have all come back negative. I am currently 17 days post-ovulation. I have a history of ovarian cysts, but...  Read Full »


Dr. Vandana Andrews

Answer: Hi, I am glad you chose icliniq for your medical-related queries. I understand your concerns about the delay in your period and negative pregnancy test results, especially since you had intercourse during your fertile window. There could be several reasons why this might happen, and I will try to ...  Read Full »

Why did my wife's ultrasound show that the baby's growth was lagging by a month?

Query: Hi doctor, My wife is three months pregnant, and the doctor is telling that the baby is lagging in growth for about one month. The fetus heartbeat is good as per ultrasound, but the fetal growth is less. My wife's weight also dropped from 125 to 121 lbs and recently, she is having stomach ache and b...  Read Full »


Dr. Sameer Kumar

Answer: Hello, Welcome to icliniq.com. The ultrasound report (attachment removed to protect patient identity) shows a baby of 9 weeks and 5 days. With the EDD and calculated date of conception, it is a case of delayed conception where the child is not lagging growth. It is likely that the mother had del...  Read Full »

What are the chances of implantation after 14 days of conception?

Query: Hello doctor, Is it possible for implantation to take place after 14 days of conception? I had flow on the exact date of my period for three days, but it was lighter. I used three sanitary pads. But next month I missed my period. I do not have any pregnancy symptoms. My TSH is 10.5. Kindly help.  Read Full »


Dr. Donalyn S. Barcial

Answer: Hello, Welcome to icliniq.com. Usually, it would take seven to ten days before implantation happens. The fertilized egg (conception day) will have to develop first into blastocyst stage and travel down to implantation site. The actual duration cannot be exact, but it may extend to two to four days...  Read Full »

How is the ovulation day in a woman determined?

Query: Hello doctor, I have a question to ask about the ovulation period of a woman. How can we count the day of ovulation? Do we count from the first day of the period or from the last day of period?  Read Full »


Dr. Ramchandra Lamba

Answer: Hello, Welcome to icliniq.com. The ovulation day is counted backward from the last day of the menstrual cycle. For example, if a woman had a regular cycle of 30 days so she will ovulate 14 days prior to her last day of that cycle. Meaning, she ovulates on the 16th day of her cycle. Another examp...  Read Full »

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