AF due today....but BFN

GF

13 or 14 dpo today. AF due yesterday or today, no show so far. Slight cramps on left side, watery cm. BFN on Walmart cheapie. Should I test in a few days or go w/AF showing up soon?

Anybody got BFP after 14dpo? I have Clear Blue tests but didn't want to waste them. Trying not to get frustrated... :(