If you not sure when conceived can your doctor tell exact conception date?

While it is not possible for a doctor to pinpoint the exact date of conception, they can provide an estimated conception date based on various factors and information. Here's how a doctor might determine an estimated conception date:

1. Last Menstrual Period (LMP):

- The doctor will ask you about the first day of your last menstrual period (LMP).

- Pregnancy is calculated from the first day of the last menstrual period, even though conception occurs later.

- By adding 280 days (40 weeks) to the first day of your LMP, the doctor can estimate a due date.

- Subtracting 2 weeks (14 days) from the estimated due date provides an approximate conception date.

2. Ultrasound:

- An ultrasound can provide more accurate information about the gestational age of the fetus and help estimate the conception date.

- By measuring the size and development of the fetus during an early ultrasound, the doctor can calculate an estimated gestational age.

- Based on the estimated gestational age, the conception date can be determined by subtracting the gestational age from the current date.

3. Hormone Levels:

- The levels of certain hormones, such as human chorionic gonadotropin (hCG) and progesterone, increase during pregnancy.

- By measuring the levels of these hormones in the blood or urine, the doctor can estimate the gestational age and approximate the conception date.

4. Physical Examination:

- A physical examination, including a pelvic exam, can provide clues about the stage of pregnancy.

- The doctor may assess the size and firmness of the uterus, which can help estimate the gestational age and conception date.

It's important to note that these methods provide an estimated conception date, and there may still be some variation. The exact date of conception can be difficult to determine precisely, especially if there is uncertainty about the timing of ovulation or if the menstrual cycle is irregular.