I have an asd with left to right shunt and an atrial septal aneurysm. do these shunts start as right to left then as get worse become left to right?

Usually starts L-->R: At birth the left side has higher pressures than the RT side. Thus flow is mainly L-->R. If the ASD is small it may close on its own but if not tends not to cause a problem. If it is large the flow L-->R increases volume load on the Right leading to increased RT pressure, this will reverse the net flow to Rt-->Lft. If large it should be closed before development of increase RT pressures.