Possibility of twins?

The bottom test was 4 days before AF, the middle one was 3 days before and the top was the day before! I did research about the possibility of a false positive, and read about how "faint lines are normal" and I was thinking "but my lines were faint at all" so I looked more into it and it said that my hCG levels were probably higher than they normally are that early, which could suggest twins. Has anyone experienced this before and can say if it is accurate or not?? I wouldn't be against twins.. I just want to know the possibility!