I'd say if you think it's a period that you got, you're probably not pregnant (whether it was lighter than usual, or not). If you're still not sure, take a home pregnancy test, and that should ease your mind.
As far as chewing it, I'm no doctor, but maybe the reason that it seemed to give you less side affects was because you weren't ingesting the entire thing? It's pretty small, so I imagine some of it would get stuck in your teeth, etc.. I don't know, I would just swallow as your supposed to, just to be on the safe side. Good luck!
Whiskers
Chewing instead of swallowing= pregnant? 
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