I haven't felt any movement ( flutters) from my baby in two days. I know I shouldn't be alarmed…

I haven't felt any movement ( flutters) from my baby in two days. I know I shouldn't be alarmed because I'm only in my 15th week but its a little hard not to. I usually feel her move around at least once or twice, sometimes even more a day. guess she's just going through a growth spurt or something.