How early did second to multiple time mom's feel their little ones move??

May • 27 y/o full time student & mom of 7 year old with downs and a 4 month old girl. Married to a dreamboat and creating my first online sales website.
I'm going to be 16 weeks tomorrow and this is my second pregnancy - 7 years later. So I'm trying to brush up on what I felt the first time. 
I've been lying in bed and all the sudden I feel something in the uterus area of my body inside. It was very odd and not a normal feeling and I'm wondering if that could have been the baby, it was very short and didn't happen again.
So how soon did other multi mama's feel their baby, I've read the first time can take longer to feel.