What's Going On?

Okay so my period is usually right around this time every month. 
<a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> says I'm 4 days late though. 
I am experiencing sore breasts and cramps just like every other month-but I'm not bleeding. 
I will feel like I'm bleeding but then I will go to the bathroom and it is just clear watery sometimes little chunks of white discharge. 
I am pretty damn positive I'm not pregnant. 
I have never had sex-though precum may have came in contact with my vaginal opening but I was never penetrated.