SAT Subject Tests?

I took the Math II in May, thinking I could use it as a practice run for June, and didn’t do so hot; (690) waiting on the June results. As per this thread, http://talk.collegeconfidential.com/university-pennsylvania/1779713-sat-subject-test-requirement.html, UPenn requires all Subject Tests taken. Assuming I did better on the June test, will the low score from May hurt my chances for admission?

No