Can i be..or is there something wrong?

I get bad cramps like i am about to start my period and then it never comes..my are getting bigger and i sleep all the time i have mood swings but ha that might be because i am bi polar but they have gotten worse..i snap at the smallest things..i get light headed and eat weird things like crackers with cream chesses and fudge its pretty good! i use to like water and now it has a nasty taste ehhh...i have had unprotected . my period was due the 8th of jan and its been over like 37 days since my last period..i have taken a test and they have come back negative..can there be something wrong with me thats making it this late?? or am i prego? i woul dbe like 5 weeks if i were what signs are there this early into it ?