Light pink spotting after sex

So I am about 14 dpo, about 3 days ago, I took 2 pregnancy tests, both came out with a vvvvfl but could maybe have been dye runs or EVAP line. Took a digital 2 days later, it said not pregnant. Today after sex, I spotted a little, and it was very very light pink, it went away already, how long do you guys think I should wait before testing again, providing that aunt flow doesn't show?