I have a D on my transcript! What's going to happen?

<p>So I'm a senior in high school and just finished my first trimester. I took three classes this trimester, one of them being AP Calculus AB. Math is NOT my strong suit and I got a D in the class. I received very high A's in the other two classes.
I just finished applying to colleges. I have heard back from 5 great schools and am waiting to hear back from UCs.</p>

<p>My question is what is going to happen if I get into a UC and send in my transcript and it has a D on it? I've heard horror stories of revoked admissions and I'm extremely worried.</p>

<p>I have taken math all 4 years of high school and took geometry and algebra 1 in middle school, so I've filled the requirement so technically this class is an elective. I also got a 640 in math on the SAT. Also, I'm taking the class right now and am working very hard to receive a higher grade this trimester.
Does anyone have anything to say that will ease my worries, or should I be worrying more than I already am? Or what other actions should I take?</p>