I got a C+ in AP Chem semester 1. Is that really bad for my transcript and to get into good schools?

Im a junior and in semester 1 in got a c+ in Ap Chem. This is my first grade under a B. Does his hurt my chances at good schools like Northeastern? What if I can get it up to a B+ for semester 2? My school does not allow freshmen and sophomores to take aps and only allows juniors to take 3-4 aps. I am taking AP stats as well and I have an A-