Regular periods turned irregular

My periods used to come like clockwork. About three months ago I was two months late and not pregnant. When my period finally came, it started extremely light for the first few days. Only needed a liner a day. Then it was a tad bit heavier for a few days. Lasted a total of about 8 days. It's been 6 weeks since the start of my last period. Nothing has changed, I'm not stressed, and I haven't changed my diet. 
​Is this normal?