am i pregnant?

i’ve been sooooo light headed and dizzy for the past week, i have been so down lately though. my mood has been through the roof! idk what’s going on. i did have sex about 2 weeks ago and the guy came once inside me on valentine’s day, and the following sunday he came two more times. idk if i’m pregnant or not. i just took a pregnancy test and it came back negative. do you think it might be still early or should i be good ?