Oo, normal lang yan during pregnancy, mama! A few of us mums experienced that, parang biglang tumatakbo ang puso mo kahit nag-rest ka lang, super nakakaanxious talaga. It's usually dahil sa increased blood volume and hormonal changes, pero importante pa rin na i-mention mo sa OB mo next checkup, lalo na kung may associated symptoms like dizziness or shortness of breath, mas safe lang if doctor checks you out directly para ma-rule out any concerns.