Hey man just some advice for the future... If a girl is stressed out there is a good chance she will miss her period. Just the thought of possibly being pregnant can cause a girl to miss.

I've had 2 pregnancy scares with my girlfriend and each time, within a day of her taking the pregnancy test and it coming out negative, she had her period.

Try not to freak out about a missing period, there are a huge number of factors that can contribute to a girl missing one. save the freak out for when a test comes out positive.