Pate Period

Heyo, I just wanted some advice... I am in no way sexually active (only 16) and my period is 56 days late. I have a mini day of spotting maybe close to 3 weeks ago, but I'm not all that sure. But I've had normal discharge. For the most part, my period has been regular, and when it wasn't I had to have a bunch of tests and crap done, nothing was wrong with me, I don't wanna go through it again. If anyone has any similar experiences I'd love to hear them. Thanks. Also, last few months my activity level has gone up-not a lot though and I have hardly lost any weight.