Hm pregnant or not

Kayla
Tomorrow I'm suppose to start my period, but I feel a weird bulg in my lower tummy (I think it's to soon) and getting a tummy ache if I don't eat and not having my normal before period stuff besides bow movement changes. I'm not craving chocolate like I usually do, not grouch not bloated not horny. Like I usually get right before it starts. But I'm always sleepy and don't have much energy. When can I take a test I took one Sunday or Monday or was it Tuesday haha anyways it was negative. When can I test again? And are these signs of pregnancy?