Faint lines then negative then very faint line???

Hello so I taken a few pregnancy tests and had faint lines, I done a clear and simple digital and it said pregnant, I then done a clear blue rapid response and had a faint line, I then done a clear blue digital and said not pregnant! I then done another Clearblue rapid response and had a cross again...I was very confused so left it a few days I got a test from morrisons and it was negative! I left it again and got some cheap ones off the internet which now have very very faint lines! Can anyone help me or has anyone experienced this? Does it sound like I’m having a chemical? In between this when I was due for my period in July I had very light pink bleeding like spotting and it only lasted a day! Hope someone can help ☺️☺️