Haven't felt my baby move in almost two days

I am 19 weeks and 3 days pregnant and I've been feeling my baby move since about 14 or 15 weeks.   This is my first pregnancy.  Normally Zion is active, mostly late at night, especially in the last few weeks, but yesterday and now today I haven't felt him move at all. My next appointment isn't until the 12th of October and I just had one about a week ago and he was healthy. That was the appointment where they did the thorough check up during the ultrasound and also I found out the gender that day. Anyway is this normal or should I call my doctor. I'm getting worried now. Just 4 days ago I felt him kick so hard and strong twice it made me stop where I was standing and grasp my stomach. So surprisingly strong I smiled had a little talk with him lol. Now he's just not moving. I tried music and tapping my stomach but is there anything else I can do to get him moving again?