how soon can you tell?

okay so this is probably a stupid question and i strongly doubt that i am but my mother figure is thinking im pregnant. so here it goes How early can you tell if youre pregnant or could be?(honestly feel stupid for this question but im doubting myself because of her) Heres a little back story.. me and my partner had sex on wed oct. 10th (last week) according to this app(if it is accurate) it said i "was in my fertile window" we used condoms. we had sex multiple times.. at some point he took the condom off without me realizing..he didnt cum in me but i know there is a possibilty of pre~cum... when i realized he had taken it off we stopped and i made him put another on. ive been really moody lately and i had a certain craving earlier and also complained about my boobs being sore so my mother figure thinks im pregnant. but you cant tell that quickly can you?