maybe pregnant

i usually start my period on or after the 24th. i started this month about 3 days early or so i think i did. all month i havnt felt normal. i have been experiencing bloating,weight gain, breast seem bigger and sore, dizzy, cramping, tired. is possible to have a period the 1st month u become pregnant? i have taken a test on the 22nd but it was negative. when is the best time i should take one? what are other signs i should watch for?