Oo normal yan, sis! At 13 weeks kasi marami pang di mo mararamdaman, lalo na kung first time mo, some moms feel movements around 16-20 weeks pa lang, especially kung anterior placenta mo. Pero since concerned ka, better check with your OB para ma-confirm na lahat okay lang and para ma-ease din ang worries mo, kasi peace of mind talaga importante ngayon.