This is not true. Bleeding in the first trimester was traditionally associated with pregnancy loss before the usage of ultrasound technology became prevalent. This was because bleeding was usually the first sign of a pregnancy that was already lost and not one that was in danger of being lost. Bleeding during the first trimester may be a good reason for your obstetrician to test you for thrombophilia, which according to our experience is the most common cause of bleeding. When a patient experiences bleeding, they should stay in bed until it eases or stops completely. Subsequently, a vaginal sonography should be conducted in order to evaluate the cause of bleeding, which in turn can most effectively guide the ensuing treatment.