Lines aren't getting darker.

So I had a chemical in May 2015 and  I have been unable to get a bfp since. This month I have gotten a ton of positives (I for sure have a POAS problem), but now I am panicking because my first response tests aren't getting darker. What do you think? I am freaking out about another chemical.
The bottom one is from this morning (12/14 dpo).
Thank you in advance!