Aspirin will help counter the effects of the birth control
pill, though, so is not a bad idea.
Lovenox is a good idea to counter the factor 5 deficiency. so in my opinion, you should continue with the baby aspirin and lovenox as ordered. As for your first question, a PFO is a "hole" in the heart that is open when you are in utero. Upon your first breath, it closes from the pressure of the first breath, because it is no longer adventageous for your body to have this hole.