To determine if you are pregnant within a month, there are two methods that are generally used: urine HCG and blood HCG. Urine HCG can be done by going to a pharmacy and buying a pregnancy test about 12 days after intercourse to rule out any pregnancy. This is because it may take about 12 days for the test to reach the maternal blood circulation and then the urine after the sperm and egg have united and the results are accurate. For example, for blood HCG, if you are more interested in knowing if you are pregnant, you can go to the hospital to have a blood test for human chorionic gonadotropin about 8 days after intercourse. As long as the result value is outside the normal range, it means pregnancy, if it is below the normal range, it means no conception, you can wait patiently for your period, usually it will come normally.