Yes only once when a midwife tried to find it at around 15w. Although she tried for 15 minutes and couldnt hear it she wasnt concerned as the numbers were coming up.

Also my baby is really active (like yesterday he was awake from 7am until about 3 in the afternoon!) but a few days of this is always followed by two days of being really quiet. So try not to worry in the meantime as every bub acts in it's own unique way.

Let us know how you go.