I have skyla, now 11 months in. I have always had a regular period. Always on time. My gyn doc. Told me that my periods would be irregular for a while, but that wasn't my case, instead of a 5day long period it was now a 7day long period (not counting the just linen pad days of light discharge). But i am now 17 days late and no period like symptoms. Should i be concerned?