The beating of the stomach like a heart is not caused by pregnancy, generally due to the beating of the abdominal aorta, through the uterus to the abdominal wall, so one will feel like a heartbeat, which are normal phenomena, generally do not have to deal with. Pregnancy is a complicated process, if you do not take contraceptive measures when having sex, usually regular menstrual cycle, menstruation delayed for more than 7 days, you can use early pregnancy test paper to test whether you are pregnant. You can also go to the hospital and have your blood drawn.