Take a test or to early?

so i had sex the day after my period ended wich was june 03 my period lasts about 6 days so the first day of my last period was May 28th. I dont track my periods to the exact day since im not ttc so i dont know exactly when i should start my period but so far i have had nothing. im noticing my boobs are starting to hurt really bad and look swollen and i also get light headed every now and then and im starting to worry that im pregnant. i took a test on the 20th and it was negative. should i take another test? could i be pregnant?