i am 24 years old, i had my period at 13th of August then i had sex on 29th of August, then i had my next period on 5th of september, but it was strange that during this period i didn't have any pain as usual, anyway after 4 days of the end of my last period i see dark brown reddish blood, i am very worried, was i pregnant and the last period was not a period actually ??? especially that i haven't had sex for a long time and that day was the only day i had sex on???
please tell me what is this dark brown blood i am seeing now
thank you