Baby kicks?

Catrina • 25. Married to my other half. 5-15-15. 1 angel baby named River. Daughter named Remington. Son named Journey.
I'm 16 weeks and 3 days and I don't know if I'm feeling my son or not. 
I feel like they are small muscle twitches but they are in my back. It will be for a couple of seconds at a time... 
Am I feeling him move or is it actual muscle twitches???