### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
i done a clearblue pregnancy test on wednesday. it said pregnant 1-2 which on the box says that means 1-2 weeks since conception. but it also said that my doctor will date this as being 4 weeks pregnant. please help. i dont know how this works and am really confused.

### output:

Hello, and I hope I can help you today. Over-the-counter pregnancy tests check for pregnancy hormone in your ruin, however the results are absolutely not reliable in diagnosing the length of gestation. The reason for this, is that the amount of pregnancy hormone in your urine, depending upon how much water you Chat Doctor. However, what the box is explaining is the way that we routinely as physicians calculate the due date for someone's pregnancy. As a convention, the due date for pregnancy is calculated based on the first day of the women last menstrual period. The pregnancy test measures the amount of pregnancy hormone, theoretically, from the date of conception. In women with a 28-day menstrual cycle, ovulation typically occurs at 14 days after the start of your period, so, that is why your doctor will refer to your pregnancy as two weeks further along than the pregnancy test. So, in the meantime, I would not worry too much about calculating your due date. When you see a doctor for the first time for this pregnancy, he or she will explain how we determine your due date. Obstetricians generally recommend that you see a doctor for your first prenatal visit at around 6 to 7 weeks gestation (from the first day of your last menstrual period)In the meantime, please begin taking a prenatal vitamin supplement, stop 