How likely are False Positives?

April • One boy, and one girl. Thought we were done, but the universe had other plans! 💕

Help! I have a Clinical Guard cheapo pregnancy test. I just tested and there are two lines.

How common are false positives with those?

It was almost immediate to show up.

I dumped my sample before looking at it though, so I can't test again with a FR one until tomorrow morning.

Thoughts?