more condoms but some are faulty

Mike takes the opportunity.
"Well, I'll get out to walk and take some air. I can buy some condoms on the way. I'll be quick but, guys, don't you dare start without me, okay ?"

The guys agree, and Mike goes out. He runs to a **** store and there buys 3 boxes of condoms and a pin. On his way back, with the pin he puntures every condom of one box and makes sure that he can recognise that specific box.

As he gets back, Courtney cheers him. She believes that with those condoms she would be safe.

That was the signal the break's over, and they resume the fuckings.

.......

Later in the night, everyone was exhausted. Courtney couldn't count how many times she was fucked, but she had to admit that she had some strong climax too. Her ass had also been taken during the night, and some of the guys had her tio suck their dick.
She didn't bite anyone after the mistake at the start.
Mike made sure the guys use "good" condoms and he was only using his "special" ones.
He believe it would be a good lesson to that bitch who bite him.

.......

In the morning, Courtney got a ride back to the parcking where her car was still waiting there. She did lost the race the day before so she didn't get some money prize, but the guy who took her back also gave her some cash.
Not so much, but she could make it until the next race.

========

Did she get pregnant during the night?
Will she notice? When?
How will she do on the next race?