6 weeks pp. Positive test not getting lighter or darker

So I took a test on the 27th. Faint positive. Then I took two more the next two days. faint positives that looked slightly darker but basically the same. I got a "negative" at the doctors o

ffice that had a very faint line Friday. They told me I wasnt pregnant and I've been waiting to see if that's true because they gave me an antidepressant. But now I tested again (with fmu) and Its a positive but it doesnt look as dark as it should but it is definately not lighter. I am so confused, shouldnt it be darker by now?

I am almost 6 weeks pp and the doctor said that the hormones should be gone but said the test was negative and I'm not pregnant. Please nothing rude I shouldnt have had sex. But here we are and I am afraid to harm my new baby, if there is one, by taking the medicine they prescribed me but I cant get a clear answer on if I am or not.

Doctors faint line.

After doctors test dried

Todays test.

First tests.

All of the tests together.