no period please help ladies !!!!!!

 ladies I'm super confused . I may be pregnant but don't know if I ovulated late and when I should get tested . I was suppose to get my period the 10th-12th of September well it didn't come . The last week of September I bled for two days . It was very little like just when I wiped and it was light pink ish . Well today is October 18th and no period . I had a miscarriage end of July had a period mid august so I don't know if anyone has experienc d anything close . I've been told I could get pregnant again quick or that my period will be out of whack . When should I start worrying . I don't have irregular periods either . Thanks in advance !