Baby moving/kicking?!

Piink

So I'll be 16 weeks tomorrow, and I could've sworn that I felt my baby move or kick me or something. So this is what happened: I was laying down after taking a much needed nap. I stood up and I felt soft movements on both sides as if he/she were kicking me on both sides at once. I've never had this happen before, and I've always mistaken muscle spasms as baby move but this time it felt different. I tried to get it to happen again but no luck. 😞