Could I ?

Okay ladies hey, so i had sex on the 27th (3 seconds of ejaculation in me and the rest pull out) 🥴😂 the first day of my “Green Week” and my period is now 3 days late.. it has been pretty regular and was a few days early last month.. Is it just late? And i took a test this morning which read negative. Is it too early to detect, or am i just late. Also ive been very very sleepy the past 2 weeks. I dont mind the result but just tryna see if im trippin or not lol. Ive never been pregnant btw .