In all likelihood, you are not pregnant. Ovulation usually occurs 14 days after a period (if your periods are regular every 28-30 days), so chances of getting pregnant after unprotected sex Sept 22 or 23 are pretty slim, even more slim after Plan B. Urine pregnancy tests are very accurate, but if you are still concerned you can repeat it or get a blood pregnancy test. As for the late period, since it sounds like this is the first time you have had a late period, it may just be stress related. If you have not had a period by November 22, you should visit your ObGyn, but my guess is that this will correct itself on its own.
I too am in the same situation as you are. I took plan b in the beginning of August and shortly after got my period, but my following period in September was 6 days late, this month I have had not period at all!!! It is now 8 days late. I have taken about 5 pergnancy tests and all have been negative.My doctor said that it is normal for your period to be off for a while since there are a lot of hormones in the plan b pill. If you don't have a period next month then I would take go see the doctor. Other wise you should be fine, just to be safe take another pregnancy test in a week. Hope this help. I hate the feeling of not knowing what is going on.
Am I Immediate fertil after taking the Plan B (Levonorgestrel)??? Because I read in one site that the fertility returns after one or two periods after taking the plan B??? Is that true? That means that I could have sexual contact one or two weeks latter and I could not got pregnant without ussing other anticonceptive method???