No, you are not required to drop your marketplace plan. You have a choice between your marketplace plan and the Medicaid coverage. You can continue on your plan throughout your pregnancy and continue receiving the premium tax credit. You can also remain on your marketplace plan and receive premium tax credits in situations where your unborn child qualifies for CHIP coverage. (IRS, Notice 2014-71; CMS, SHO#14-002, Minimum Essential Coverage, Nov. 7, 2014).