Lo loestrin

So I started the birth control pill lo loestrin fe when i started my period. I read that it is effective immediately if you take it on the first day of your period. I took it at 8 then 9 then 8 then 9 then 8 so basically Every other day I took it an hour late. I have had sex without a condom but he pulled out each time. I doubt I'm pregnant but what are my chances? Has anyone gotten pregnant on this pill?