Confused, please help

Hello everyone! Someone help me with this... my menstruation is irregular. Last aug 10-17 2022 i have my period. Aug 20,27, and 28 i got intercourse but no ejaculation. Last night(august 29) my abdomen was so painful and i saw black blood on my underwear. , pain continue until morning. Early this morning i saw brown red blood in my panty (i will attached photo) the blood is not heavy and also not light. Just moderate. Until now(night) i have a little blood just a little..

My question is i am pregnant or is this period? But if this period why do i have period 2times in 1 month? Pls help.