My son walked in graduation in May 2005, with one class left to take. He had a decent job waiting. He was in an apt. and working in the city, 4 days after he came home. He signed up for an on-line course to finish, during the next fall semester. At this point, he had around a 3.6 average. He had taken an on line class during the previous January term, while he was commuting back and forth between home and Amherst and he got an A.
He failed the class. He just didn't do some of the work; the allure of the working life/having fun was too much. I was furious and refused to pay for another course. He let another semester and summer go by, and we were increasingly concerned he would never graduate; but he signed up to take intro to exercise physiology on line in the Fall of 06, and he managed to pass that, I think with a B. He finally got his diploma in February, 2007 and he still graduated with honors. He got a new job in Sept. 2010, and I don't think the F hampered him in any way. So, I doubt this would affect you.