Positive or no?

I've been experiencing mild cramping, and 3 instances of light pink spotting in the last week. Is that normal? At first I thought this was a positive but now I have no idea...just anxious/nervous! Here are the tests at 11, 12, and 13dpo. The test got darker from 11 to 12, but kind of stayed the same at 13. Thanks ladies!!
11 dpo below 
12dpo below
13dpo below