Am I?

I’m tracking my period on 2 different apps. One says I’m 5 days late. The other says I’m 8 days late. I tested yesterday and I’m negative. I don’t know if I’m making my symptoms up because i want it so bad or I actually am having symptoms. I recently started exercising too. I’ve been achy, mild cramps on and off. White discharge. I plan to test again on Friday even though I don’t want to wait. Tell me what you think..possible pregnancy or just missed period due to exercise??