UPDATE TIME!!! Alright. So you said the bleeding you had was the same length and about the same heaviness as your normal period, it just smelled different.
You know how there's a hormone that your body gives off when you're pregnant? Well, what Plan B does is it puts an dose of that horomone into your body, which makes your body think that it's pregnant. And you can't get pregnant if you're already pregnant, so fertilization/implantation doesn't and can't happen (this is if you take Plan B within the time they tell you to).
What this means is, you're not pregnant. The reason your period didn't smell like a normal period is a result of the hormone that is the Plan B pill.
Also, the fact that your period was the normal length and heaviness suggests that pregnancy has not occurred.