Kick counting.

Diane
I'm 23 weeks and 3 days. Over the weekend I notice I wasn't feeling my little girl
Move around as often. I felt her just not as much. I have an anterior placenta and was told that it could soften kicks and punches ect.  I called my doctor yesterday and the nurse explained to me that I should kick count. I should feel six movements in 2 hours. I did this three times yesterday and within 15 minutes I felt six movements. Of course I second guess the movements for gas or muscle spasms as I'm a first time mom with anexity. But it's around the same spot and feels like her. So I'm happy with the counting results I just feel like the advice to starting counting is early. Everywhere I read or people who I've told this to all say week 28 you start that. I don't have a high risk pregnancy at all. I just don't want to panic if this is to early to start counting. My gut says my little girl is fine. But I want you opinion too early or right on track ? And has anybody at this stage notice a fluctuations of movement day by day ?  Thank