Could i be pregnant?

So we've been trying for almost a month now. I got a pregnancy test done 2 weeks ago and it was negative (i had only ovulated a few days before.) Lately ive been feeling heavier, more fatigued, and eating more. Also my dog has been acting weird, hes been following me everywhere, laying his head on my stomach, and being very protective of me. My period is supposed to be in 4 days. Do you guys think i could be pregnant? Should I take a test now or wait until if my period is late?