Larano,
first things first. Take a deep breath...Whatever happens, you need to be calm. Now, if you started the pill in may, you should be ok, so long as you have taken the pills properly. You said you got your period a week after you had sex in july. That is a good thing, and you probably (although we cannot 100% say for sure) you are not pregnant. On the pill, you should get your period during the 4th week of pills (the placebo pillls) but since you just started the pill, things could take a few months to settle down and then your period will be like clockwork...I even can pin it down to the hour it will likely start now. Are you able to go back to the doctor that gave you the pill in the first place? If you are, go and talk to him/her...If you are really worried, go to a women's clinic or the hospital, and have them do a blood test. I am hoping you live in canada, because all this is free, but if you are in the states....Borrow money from a friend, or tell your male friend he better help you out.
No matter what happens, everything will be just fine.