Am I pregnant? False positive?

I’m 5 months PP and I am on birth control. But I have been having weird symptoms so I told my husband I was going to go ahead and test just to be sure so we can stop overthinking. And the first picture was the result, it has 2 lines the first one faint pink. So this morning I took another and the line is barley there. Does this mean that the first One I took yesterday was a false positive?