Is it worth staying an extra year to finish a second major? Both STEM majors

I’m currently a junior with an intended BS in Biochemistry major, and I’m on track to graduate in 4 years. However, I’m finding that I’m only four classes away from also completing a BA in Chemistry. My goals after college are graduate studies in either biochemistry or organic chemistry, so I think taking extra classes in chemistry may help me choose between the two fields. However, I’m realizing this pretty late, and adding a BA in Chemistry will definitely hold me back an extra year.

I used to major in ChemE so I have a lot of STEM elective credits and will graduate with a math minor and chemistry minor if I decide to graduate in 4 years with my BS Biochemistry.