You'll be fine! Never give up. Being good at math is seeking to understand what it is you're really doing, not just solving a given problem in front of you. Make good use of the tutoring labs and youtube (mathispower4u is great!)
Retake and study hard. Do not allow one grade to make you disheartened. Sometimes it takes a second time around for the material to truly sink in, but you will definitely have your "Eureka!" moment if you persist. Trust me, it happens all the time in math.