Do I need to adjust my SLCSP on 1095a If I had a 1095b for 1 month?

Hello,

I have a question about reconciling my ptc on form 8962.  My wife and I were covered for 12months under a marketplace plan which I paid the premiums for.  If I enter the 3 columns as printed on the 1095a I am due a $300 credit.  

 

My wife was sent a 1095B from Medicaid where she had mec for pregnancy for 1 month in Jan.  We thought it had ended in Dec 2018 but turns out she had it in January of 19.

 

How can I adjust the SLCP to pay back the difference in the credit for the 1 month she had MEC and Market place coverage?