Pregnancy on day 17 of 14 days of intercourse whiteboard is seen as normal. Sperm can survive in a woman’s vagina for 2-3 days after intercourse, and as long as an egg is expelled during this period, pregnancy is possible. After the sperm and egg have united, it takes about 1 week for the fertilized egg to successfully implant. At this time, the placental trophoblast cells gradually begin to secrete human chorionic gonadotropin, which is present in the blood and urine of the pregnant woman. However, because the hormone level is too low at this time, the test strips may not be able to detect it accurately and thus show a white plate. During this time, as the fertilized egg develops, human chorionic gonadotropin doubles, and after the 12th-14th day of its formation, the level has reached a standard that can be detected in the urine. In addition, in early pregnancy, factors such as drinking too much water before the test and poor physical and mental state can lead to inaccurate results. At this time, the mother can go through the pregnancy more smoothly through the following ways: 1, regular maternity checkups: through the checkups can monitor the development of the fetus, in the face of poor development and other conditions can take measures to give early intervention to try to avoid adverse consequences; 2, dietary conditioning: pregnant women should have a rich and varied diet, you can eat some protein-rich food, such as lean meat, milk, etc.. But should not eat too much, so as not to weight and fetal growth too fast, so that the pregnant woman is overburdened; 3, moderate exercise: you can do some relatively safe and gentle exercise, such as gymnastics, yoga, etc., exercise muscle endurance, reduce the body burden.