As mentioned in the above answer, you can definitely consider MD/PhD programs. Alternatively, if you are interested in research and don't want to practice medicine, then you can think about attending a PhD program in life sciences. The majority of universities have PhD programs in their Schools of Medicine, Public Health etc. These will allow you to focus on research in your chosen field of medical sciences.
Of course, getting involved in undergraduate research will benefit your application for PhD programs incredibly. It will also help you learn more about research environment and choose your research interests as well as introduce you to a community of researchers (especially if you spend a couple of semesters/years in the same research group as an undergraduate researcher).
Wishing you all the best in your future endeavors!
Best of luck!
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