feeling subtle movements in my tummy

so I'm trying for baby number 2 in Aug my period didnt come and in Sept. i got my period I figured my cycle must of changed because my period came early in the month...my period should have started today Oct. 10 but it didnt point is I've taken test and all negative I dnt feel nauseous just really tired and feel the feeling in my tummy as if something moves I know is not gas because TMI I've past gas right before the feeling and the feeling is still there and I feel the feeling throughout the day can this be in my head or can I really be pregnant and get negative tests??? someone help plz