Oo mommy, normal yan sa second trimester! A few of us experienced that, parang may pressure or heaviness sa ulo, diba? Kadalasan it's from hormones, dehydration, or posture changes kaya siguruhin mong umiinom ng maraming water at magpapahinga ng maayos. That said, kung ang sakit ay persistent or sobrang intense, better check with your OB para sure lang, mas peace of mind lang, especially nung pregnant kami nag-alala ako sa lahat haha!