THC Drug Test. A marijuana drug test is the technical analysis of a biological specimen, such as urine, blood, hair, sweat or saliva, to determine the presence or absence of the active ingredients of marijuana (mainly THC) or its metabolites (breakdown products).t is important to note that urine tests are usually conducted to test for the presence of THC metabolites which indicates marijuana use. Blood tests are conducted when the amount of THC still present in the system has to be ascertained.
How is my due date calculated? Your due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period (assuming a 28 day cycle). Note that your menstrual period and ovulation are counted as the first two weeks of pregnancy. If you deliver on your due date, your baby is actually only 38 weeks old, not 40.
Likely date of conception: End of your first trimester (12 weeks): End of your second trimester (27 weeks): Your baby is due on (40 weeks): Number of weeks you have been pregnant for: Calculate how many weeks you will be pregnant on a given date.Number of weeks you will be pregnant for: Calculate the date you will be pregnant for (input x) number of weeks.he formula to estimate the due date of a baby is calculated by adding 266 days to ovulation (Ovulation Calculator), or 280 days to the first day of your last menstrual cycle. Human female pregnancy lasts 40 weeks on average.