I have been diagnosed with atrial septal aneurysm and now know there is a PFO after having a bubble study done only a few bubbles seen. Should I worry?

Possibly. You maybe at increased risk of stroke. Patients who develop strokes of unknown cause (cryptogenic) have a high probability of having a pfo/aneurysm. Stroke prevention may include medications such as aspirin plavix (clopidogrel) or warfarin. Consultation with a cardiologist who can visualize your echo films or possibly do a TEE can guide you further. .