2 Faint BFPs but...

I'm not sure when I O'd but I'm CD37.  Yesterday I took a FRER and got a faint line.  This morning I took a second FRER from the same box and got another faint positive.  I went to see the doctor at lunch and took another urine test (don't know which they use), then took a third test, this time an E.P.T + - that had the faintest positive ever.  Then the doctor called me back and said that their test was negative.  I then took a second E.P.T. and it was negative (although at that point it was 3pm and my urine was pretty diluted).