Late period not sure if I'm pregnant or stressed

Jazlyn • Single mother of a beautiful 5 month old baby boy named Rowan ❤️💙
Me and my boyfriend had unprotected sex on the 24th of January and I was supposed to start my period on the 11th of February but now it's the 21st and I'm 4 days late I took a pregnancy test and it came back negative ,I just moved and took 3 planes to get here could I just be stressed or should I take a test in a couple days ?