Bad news then I'm afraid Jessica.
The first round counts see rules
"You may play with any player that is part of the competition in a multi
play practice mode game. A player already played in a round may "mark"
for another player. Both must save cards and clearly state who the
"marker" was"
You had not already played when you Marked therefore your first card will count.
As you could imagine . Anyone could keep playing , then if having a bad round, saying "Oh I was marking"
That is why No-one can mark until they have ALREADY played