Feeling babies move

Kristi • FTM B\G twins born 2/5/19

FTM who is plus size and currently 15w4d pregnant with fraternal di/di. Trying to figure out if I’m feeling the babies or not. When I press on my stomach just below and to the sides of my belly button I feel what feels like my pulse. When I did it again a few minutes ago I didn’t feel the pulse thing that time. Could what I thought was the pulse actually be the babies moving?