Marginal placenta moved .5 cm

Ana
Found out my placenta moved .5cm away now its 2.5 away from my cervix..but i have a opening in my cervix as the tech was trying to measure it. She was head butting it she wants out..i will be 24 weeks tomorrow trying to keep her in..i see my ob monday scared she is going to put me on full bed rest ..but whatever it takes to keep my lil princess healthy. ..