It is completely normal to not see anything on an ultrasound at such an early stage of pregnancy. At 4 weeks and 2 days, the embryo is still very small and may not be visible yet. The gestational sac, which will eventually contain the embryo, might be visible, but it can vary from person to person. It's important to remember that every pregnancy is different, and the timing of when things become visible on an ultrasound can vary. If you have any concerns or questions, it's always best to consult with your healthcare provider who can provide personalized guidance based on your specific situation.