Upward Trend/ Postbacc?

This is my breakdown in terms of gpa throughout college. I started out undergrad pretty slow with a 2.7 gpa freshman year, 3.25 sophomore year, 3.0 junior year, and a 3.4 senior year. Overall I have a 3.1 c/o 2021. I was wondering if this would be considered a good enough upward trend because of my junior year gpa which was heavily impacted by Covid. Also, if the trend would tell enough of a story to get me into med school or if I should pursue a postbacc?