Still no period but BFN

What is the latest you ladies tested positive after a missed period? I had a chemical pregnancy in January it was a heavy period from the 17-21 my doctor gave me the all clear to TTC- we BD on all the right days and then some after- last Sunday I had two days of very very light pink spotting would have been about 10dpo and not enough to even wear a pad and it’s been happening on and off- my period was due the 20th and I’m two days late had cramping (and usually that leads to my period coming on quiet heavy)

Anywayyssss long story short when do you get your BFP after your missed period 😘