what is this?!?!?

okay i just got off af on the 22nd it was a regular period everything has been normal beside me being moody and crying like 3 days in a row last week its been normal and im not due for af til the 12 of sept my periods are ALWAYS far apart so i just used the rest room and i wipe and it was light brown like real light brown and this is the last wipe im so confused... ive heard of IB but i kno its not common and ive hae absolutely no symptoms at all beside what i explained above and falling asleep at like 730-8 the other night i didnt say a word to no1 i just went to my bedroom laid on the bed and knocked out all night lol thanks to my so he handled everything but if i was just now having IB i wouldnt have had those symptoms already right? idk im confused sorry so long i might b jumping the gun but this stuff doesnt usually happen to me...and i haven't been doin what i usually do i havent been checkin my cervix or paying ALOT of attn to my cm and we have been bd just whenever cuz its no where near my fertile week according to glow anyway? has anyone had this happen and b pregnant or anything let me kno ladies would love to hear any feedback thanks xoxo