Aww jangan worry sangat! A few of my mum friends had the same thing at 20 weeks, and their placenta moved up as the pregnancy progressed, it's actually quite common at this stage because the uterus is still expanding. Keep your follow-up scans on track and the doctor will monitor, tapi biasanya ada masa lagi untuk things to shift positively. Doa memang penting, tapi in sha Allah placenta usually moves away on its own as baby grows, fingers crossed untuk you!