Birth Control Taken Late & Period Questions

I just started birth control about a month ago. My last real period was May 29th,Friday. I started birth control on May 31st, Sunday, the first Sunday after my period started as instructed. I am taking Levora 0.15/30-28. It has 21 active pills and 7 placebo pills. I have taken all of the pills everyday around 7:00pm to 7:15. This past Thursday, June 18th I took the pill one hour late at around 8:15pm by this day I was on my 19th active pill. This was the latest I have ever taken the pill. I did have sex that day,Thursday June 18th, with no protection other than the birth control. I also had sex with no protection on Friday, June 19th,and Saturday, June 20th. My boyfriend did "pull out" all three days so he did not finish in me. I am right now on my 4th day of the placebo week and I did not get my period. Is it possible that I am pregnant? Is it too late for me to take Plan B? When can I take a pregnancy test? If I don't get my period by Saturday should I still start a new pack on Sunday? I would really appreciate if someone could get back to me as soon as possible since my doctor is out of town on vacation.