Colored Mucus Before Period Vaginal Mucus, And No Period?

Vaginal mucus, and no period? - colored mucus before period

ok so I had a lot of vaginal mucus and white or transparent, a little earlier had been a brownish color. I wish I had my period at 27 or 28, but already the 2nd and I did not make it. Is there an explanation?
I think that because I was very sick and was taking antibiotics can, but stopped because they do not work ...
I'm not sure.