The undergraduate course of study you pursue should not prevent you (nor automatically qualify you) for post graduate study in teaching.
If you wanted to be a single subject instructor (science, math, English, etc.) in secondary school, then your B.A. would determine which subject you are qualified to teach. Your goal of teaching elementary school means that your B.A. won't deter you in any way from becoming a classroom teacher.
As has been pointed out, if you under-grad grades are good enough, a master's degree education program should have no problem accepting you and turning you into a qualified, certificated teacher.