PLZ TELL ME IM NOT PREGNANT AGAIN!

Ok sorry if this gets kind of long..

soo last week (we’d,thurs, fri. & sat i believe) i forgot to take my bc pills

sunday was the day i would have started the period pills well saturday(even tho i didn’t take my pill) i started spotting (& i don’t usually spot/bleed until like monday/tuesday)

it was basically all brown and old looking i bled for like a day and a half and now nothing could i have gotten pregnant in that short amount of time or is my body just out of whack somebody please give me some kind of advice!

TIA