1st time mom that hasn't felt baby kick?

Jenny • I have an angel from December 2013, a baby boy born December 2014 and now tcc for a sister or brother after the sum!!! ♡
I'm currently 18 weeks along and don't know if I have felt our baby kick. I've heard heart beat at last appt last week. And check it weekly with my home moniter. any other first time moms not feel baby kick yet? Due December 20, 2014