testing twice in 24hours ?

I didn't test morning then night on the same day but I did test on a Saturday morning and there was nothing then tested around 3am on the Sunday morning and got a line.It was very faint so I waited until around 5am on the Monday and it was positive, I took several tests that day and they were all positive, I was 11dpo at that point.

I have read that people have but your best bet is to wait a few days and try again with fmu