Am I pregnant?

This is my first time ever experiencing any of this and I'm 27. I had my period 22-27 the 29 and 30 I had really light pink bleeding it didn't get on my underwear or anything it was only when I wiped. Then the last two days if I moved quick or got up really fast the room would spin and I was extremely light headed. I've been having dull cramping in my lower stomach and vagina also back pain off and on. I'm just now starting to get leg cramps. I've been extremely tired and been taking naps during the day. Alps have a weird burning sensation in my stomach. I've been craving cheeseburgers like crazy. My period is due again on the 12th. My period has changed dramatically in the past month I've been getting my period every 16 days instead of 21 days. Can someone please give me some advice. I've also been having unprotected sex a lot and he has cummed in me many of times.