When would you call your doctor?

I’d say 10

I’d probably go a week late and retest and then call my doctor.

Three weeks after missed period and tests

Probably around 10-12 days after my missed period. Unless you really feel something is wrong. Otherwise it's up to your discretion when you wanna call your doc.

I wouldn't worry unless I missed two periods in a row. Occasionally my super regular body has missed a period or two.