Hi, i had my periods on the 17 February until 21 February. And i slept with my ex on the 26 February and on the 1 March i slept with my boyfriend. And now i am pregnant. I am not sure who the father of the baby is, i calculated and i conceived between the 26 February and the 4 March. What are the chances that it might be the ex boyfriend. PLEASE HELP ME Calculate....