Heartbeat at 5 weeks and 6 days

Hi moms! Sino pa po dito ang naka experience ng wala pa madetect na heartbeat sa ultrasound ni baby ate 5w and 6d? —sa first baby ko kasi 114bpm niya at this age. Pero sabi ng ob it’s okay. Sometimes sa ultrasound daw talaga minsan hindi pa madetect. Around 6.5-7.5 weeks pa daw onwards.