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Herbs are notorious for causing extended delays in periods, so that definitely could and most likely be the cause. But I wouldn't stress yourself out unnecessarily, because that could further delay your period, as well. To put your mind at ease, buy a cheap pregnancy test, and that way you can know with more certainty and hopefully get some peace on the issue. 

I've personally experienced delays with my periods using MSM, and I saw that you were once taking that, but really it could be any number of things that you are doing/taking that could have had a hand in delaying your cycle.

Some natural ways to induce your period: Have sex (or masturbate), do cardio exercises, drink ginger tea, parsley tea or cinnamon tea. Some foods that also help to bring on your menstrual cycle are: celery, cumin, papaya, almonds, grapes, aloe vera, sesame seeds, yogurt, soy milk, tofu. You can look up a number of emmenagogues which are foods that help induce period. 


Hope this helps, and puts your mind at ease. 

Xoxo