Less movement

I am 29wks tomorrow with di/di b/g twins. Friday night I realized that I didn't feel them moving like normal, maybe 5 kicks total. The next day was the same. I used my fetal dopplar and their heart rates were fine and at their normal levels. I started feeling more kicking Sunday and Monday and today but still not like before. I have an appointment this afternoon so I will ask then but has anyone else had this happen?