how can you tell if your ovulating for the first time?

Its hard to tell. You may have some slight cramping and your vaginal discharge will be clear and stretchy, like egg whites-like this http://www.tryingtoconceive.com/store/ewcm5.jpg

This happens, because that type of discharge makes the sperms journey to the egg easier.

Otherwise, its kind of hard to tell when you are ovulating.

go ask your mom or google it or go to a doctor and it different for everyone