Normal lang yan, mama! At 15 weeks, the normal fetal heart rate is usually between 120-160 bpm, so 163 is just slightly on the higher end pero totally within the okay range, a few of us had similar readings and our OBs said it's nothing to worry about, lalo na if you're anxious or the baby just moved during the ultrasound. But since every pregnancy is different, definitely confirm with your doctor on your next visit para totally peace of mind ka, okay? Congratulations sa baby!