That is true at the public high school where I live. An A in a regular class is a 3.7. You need an A+ to get a 4.0. Also where I live physical education would be a regular class.
However, an A in a PE class is not going to harm a student’s chance to get into Notre Dame.
@lbruns I think that your chances are pretty good, and very likely higher than the 13% or 17% or 19% acceptance rate (depending upon which source I believe). However, I would be inclined to put it out of your mind, and continue with applications to other universities until you hear back.
Given your excellent results up to now, I think that you are likely to do very well regardless of which university you attend. Also, there are a LOT of universities with very good premed programs. It looks like you are considering the cost of attendance, which is quite wise for a premed student (medical school is expensive). Best wishes.