Clomid and ovidrel question

Alison • 33 married.ttc.1babyboy. 2mc 1 ectopic w/tube removed

I did clomid abd ovidrel, and I know it can delay your period, but for how long???? I'm currently 19 days past the injection. They told me to test at 16 days. Still negative tests and still no period....

Curious to others experiences

Did anyone get a healthy positive a few days later than normal?