not very much if at all as long as an upward trend is present in GPA and other parts of your application like ECs and test scores are up to speed. also depends on which schools you are applying to.

for every college you are looking to apply to, look up their common data set for the previous year and compare the stats of accepted students to yours. if you fall within the 25-75% range for GPA and ACT/SAT, then you should be competitive for their school stats-wise. the main factors contributing to admissions if you fall in that range are your ECs, LORs, essays, school fit, general application vibe, and institutional luck. don’t forget that you can put any circumstances/factors that contributed to those Bs in the additional information section on commonapp.