Please I Took Postinor2 30 Minutes After Sex And Took

Please I took postinor2 30 minutes after sex and took genicure 20 minutes later.. I took the other postinor pill after 12 hours.. I had sex a week later a took contra 72 immediately after sex and took the next pill after 12 hours.. I take EC pills after sex all the time but I bleeder for two days last month and hvnt had my menses since then till now.. I Hv tested for pregnancy three times and it is negative.. Culd I be pregnant or is it the side effect of the pills??