Does embryo have a heartbeat at 5 weeks?

Yes according to this website it does http://www.mayoclinic.com/health/prenatal-care/PR00112 At week five, your baby is 1/17 of an inch long - about the size of the tip of a pen. This week, your baby's heart and circulatory system are taking shape. Your baby's blood vessels will complete a circuit, and his or her heart will begin to beat. Although you won't be able to hear it yet, the motion of your baby's beating heart may be detected with an ultrasound exam. With these changes, blood circulation begins - making the circulatory system the first functioning organ system.