I'm stressed out! Help!?

Today I just finished my last paper, Literature. Then I realized that I have wrote more than expected. Here's the instruction for the essay 'In the respond, your essay should be in about 150 to 200 words' But I wrote 326 words. Will I get penalized? I don't want to lose marks because of this... I'm so scared and worried about this issue. Do you think the teacher will give me chance?