Positive and negative tests?

I got a few faint positives this week and I'm talking really faint then the day before yesterday I got a faint positive but clearly positive, then yesterday evening I took a 2 tests one looked almost negative the other was soooo faint then when I woke up I took one more and it was pretty much negitive so I took one this evening and positive...I'm super confused why do I keep getting negatives and positives?

This was my positive.

This was from the other day. But inbetween these positive tests I got 2 negatives?