Had irregular periods in June and beginning of July, had sex a few occasions. Started back on birth control beginning of this month, but no period. Is there a possibility of pregnancy?

I had two 5 day long periods in a month and in between I had a 11 day break. For example... First period: 06/24/19-06/28/19; Break Days: 06/29/19-07/09/19; Second Period: 07/10/19 -07/15/19; Dates of unprotected sex: 06/07/19, 06/13/19 & 07/01/19. Started combo bc pill the beginning of this month: August. Could I be pregnant?

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