Worried about a slip in my summer class GPA from one failed assignment

How screwed am I if I end up with a B- in the course? My current overall GPA is 3.6 and my current class GPA was in the high A range, before I flunked a project worth 30% 😖. Right now, I have a 79.8 running average, though I'm still waiting on two more grades, which I'm pretty sure are As.

I'm so discouraged because that one assignment may hinder any chance at getting at least a B in the class. Do you think professors (at grading time) consider overall performance when you have one screw up?