1095A Health Insurance Tax Credit

I received money for the health insurance tax credit to offset the monthly health insurance premiums I paid based on the unemployment income I received, but took money from my IRA in Nov which made my income for the year higher, will I have to pay back some of the money I received for the tax credit?  How do I pay that back is it calculated as part of the taxes I will owe for the year?  When do you have to pay taxes if you owe, can you get an extension to pay later in the year?