Discharge 2 days before my period?? What's going on?

OMG! I have experience brownish discharge 2 days before my period it's not my period!. But this discharge when I do my research it tells me it's normal for ladies that's trying to conceive and also glow told me to test for my pregnancy yesterday but I was so nervous of getting a negative sign I didn't I was just going to wait and see if I missed my period?. What should I do.. Anyone experience this???