Faint Positive but Negative Blood

Holly • First time mom to be after 20 long months and we are so thrilled!
Hello all! Thanks for stopping by to read, and please comment if you have or are experiencing the same thing! AF is due on Sunday, 5/14 and on Wednesday, 5/10 I got a vvfl postivie on a hpt. I called my doctor and got a blood test done and the results were negative. Also, on 5/11 I wiped and had a light pink discharge so I'm super confused and was wondering if anyone has experienced this. Im going to wait to see if I start my period this Sunday, but just wanted to see. Thanks again! 
The top one is water(just for confirmation of good tests) and the others are from this week & bottom is this morning.
I'm on my second round of 50mg clomid and ttc for 17 months.