We have helped you on this before. If you bled heavily, like a period, from 4-6 September, it's entirely plausible that about a month later, you'll get your period, which would bring you into October.
Nobody can tell you over the internet if you are pregnant - that is what pregnancy tests are for. Since your tests are all negative, then you are not pregnant. You need to be patient and wait for your period - a delayed period due to taking P2 is very common - you need to wait it out.