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I was in a similar pickle several years ago.

1.) They know exactly what's going on. Don't worry. I want to make it absolutely clear that the left hand doesn't know what the right hand is doing in the recruiting process, and HR doesn't make hiring decisions, but the HR lady on the phone probably has about eight years and thousands of applications of wisdom on you. When a candidate stalls, 95% of the time, regardless of the reason they give, it's because they have another offer. 2.) They also know you're a college sophomore. Just a 19 year old kid. Two years ago, your mother practically tucked you into bed at night. They understand you were afraid to tell them you were considering another offer. If you were 25, this would be a different story. But you're young and it's OK. They know you're nervous and they know this is probably the first white-collar job you've ever been offered. 3.) They liked you enough to give you an extension. 4.) If you get the PE offer, call them FIRST and THEN send a pro-forma email so it's less awkward and you don't lose sleep about them getting it.

50% chance your parents counseled you on this already, and I'm going to say they're a lot wiser than I am. If they told you something different and they have any US-based white-collar work experience between them, please follow their advice.

I've got six or seven years of wisdom and experience on you. I don't know everything, but I know enough to tell you not to worry all that much about this.