I feel movement (like fluttering) all around my stomach. Could I be pregnant?

I feel kicking and fluttering around my stomach regularly and I'm wondering if I'm pregnant? My periods are still irregular (I'm 17) and I last had just over a month ago. I haven't noticed any weight gain, but do have slight dizziness and we did use a condom which to our knowledge did not break and it certainly wasn't expired. I also have gas and sometimes feel tired and queasy without throwing up or anywhere near throwing up. Please help???