It is common for a fetal pole to be visible on an ultrasound at 7 weeks of pregnancy, but it may not yet have a detectable heartbeat. The development of a heartbeat can vary from pregnancy to pregnancy, but it is typically seen between 6-8 weeks gestation. If there was no heartbeat detected at your 7-week ultrasound, your healthcare provider may recommend a follow-up ultrasound in a week or two to monitor the progress. It's important to remember that every pregnancy is different and sometimes it takes time for the heartbeat to become detectable.