It is not possible to detect pregnancy by any means for 25 days. Because the menstrual cycle is usually around 30 days, if you consider if you are pregnant after your period is delayed, you will have to test with an early pregnancy test to know. Usually at the time of knowing pregnancy, due to the short menstrual cycle in some cases, it can be around 35 days, and after a vaginal ultrasound, a very small gestational sac can be seen. Therefore, the appearance of 35 days is the earliest you can go through the ultrasound method to see if you are in a state of pregnancy. In addition, you can use early pregnancy test paper to test if you are pregnant only after your menstrual cycle has passed. Usually, it is impossible to detect pregnancy on 25 days.