Positive and then negative results

Sophie

I took a test on Sunday 9DPO and used the first urine of the day and as you can see I got a faint line indicating positive (faint enough to be seen in the picture here) I then tested again today and it wasn’t the first urine of the day I have also been drinking lots of water this morning and did exactly the same test but got a negative result! Now I’m not sure what to think