should i bother testing or should i wait?

i’m like 7 dpo or something (not ttc, just kinda in a pregnancy scare right now) and i’ve been nauseous, getting pretty bad headaches, (both of those i don’t think would show so soon if i really was pregnant so i’m probably just sick) but what really throws me off is i’m exhausted and my boobs are sore.

my cycle is around 30 days long and i looked it up on the first response website and i can test in 2 days.

i’m wondering if i should get a test today (only time i can get out and possibly get one) and take it early or should i just wait to see if i missed my period?

i’m just so... anxious. and i know i shouldn’t drive myself too crazy cause then it’ll be all in my head, but i has unprotected sex cause it was in the moment and he pulled out and came on the outside of my vagina (like not inside but near the opening) and that was like a day before i ovulated. when i went to pee after there was cum in my underwear.

and yesterday my boobs were a litttlleee sore but today they’re pretty bad. and i never ever get sore boobs.

i’d rather test before to clear my mind, but would it just be a waste?