I usually bleed every 28days for 4 1/2 days long for the pasted 4months and every 26days for 4 1/2 long Jan. Feb. March. I was expecting my period to arrive on Aug 12 but I bled on the 8th very light pink at first then red then pink brown and stopped completely on the 9th. I do have PCOS I am pretty normal with my periods but this month has me concerned yes I am sexually active/unprotected test was negative two days ago. I am having symptoms but idk

Am I pregnant?? Any advice???