When to test after giving birth??

I gave birth to my first 11 weeks ago, and while I’ve been religiously taking the mini pill, I noticed some light spotting and moodiness that doesn’t happen when I’m regularly on the pill.

I’m tempted to test, but have no idea when I should, as I’m not sure if I’ve even had a period yet, and we certainly weren’t trying so this is not quite the exciting situation it was last year...

Any advice would be appreciated !