Dizzy when I stand up

Brittany👨‍👩‍👦‍👦☕️ • 28 yr old Boymom of two wonderful boys, Blaine and August. Currently pregnant with #3! Due December 2016 😍
Is this normal?! Lately I've been getting really dizzy when I stand up. I don't get up super fast or anything either. I'm 6 wks 2 days with baby 3 and I don't remember feeling this with my other two. Does it mean anything?