Hi I Recently Started Using Birth Control Pills (aleese 28

Hi I recently started using birth control pills (aleese 28 day) i started using them tge sunday mt period was almost done. I used 13 pills and missed 3 days so stopped using them. I had sex unprotected on 3 different accasions November 1, 22 and December 5 according to my period tracker I had a period a period on December 7-11th then on December 30th I had spotting with a brown colour that I never seen unless I wiped deep. That was off an on for a couple days. Now my period tracker was indicating a next period come which I am 5 days late . Can you help me understand please.... am I pregnant or what?