Lines not getting darker

I got my positive 2 days ago. I’m still getting positives on clearblue digitals I did a frer digital this morning and it was negative but last night it was positive. Last night and today I had a much darker line but in the afternoon and evening the line has become much lighter.

(Pic 1 is first positive 2 days ago)

(Pic 2 is from yesterday)

(Pic 3 is today)

(Pic 4 is from this evening - 4 hour urine hold, I didn’t drink anything either to prevent dilution)

I was supposed to get blood work today but my ob never called me back. I really don’t want this to be a chemical again 😞

Edit: I did a frer digital tonight and it was positive! However my lines are still light /: