Y'all are going to call me crazy, but... Lol

I have 4 kids (7, 4, 2, & 9 months). Lately I've been having this feeling in the mornings that I'm missing a kid. We will all be downstairs eating breakfast and listening to music and I'll think "wait, where is... Who am I missing?" Then I realize we are all there. Is this a sign I need another?! Anyone else have thoughts like this? It's different than my panicked oh no I can't find a kid on the playground feeling. I can't quite explain it I guess.