I'm 20 recently had ep my periods last only 4 days and always come early between 4 to 6 days early. i'm ttc. idk if i am ovulating or not? help?

Probably: If your periods always come early that sounds like you are pretty regular. Regular means predictable and you can predict within a day or two when they will start. Normal is any where from 21 days start to start to 35 or 42 days from start to start based on which text you read. Try counting back 14 days from when you expect your period and do an ovulation predictor kit. It will likely be positive.