Baby’s heart rate

Jennifer • Boy mama to two boys, 6 and 3 💙💙

So at my first scan at 6+6 baby’s hr was 148 , at my next scan at 9 weeks baby’s hr was 179, my next visit babys hr was 158 and now today I️t was 141 at 16+1 ... should I️ be worried that I️t keeps going down?