flip, i have been getting like your tests since 8dpo but mine aren't getting any darker even at 11dpo wonder what it means
Your HCG doubles every two days. So if you got a veeeery faint BFP on 8DPO, then your test should look the same on 9DPO. At 10DPO your test may look ever so slightly darker, but since its still so early I wouldn't get too worried if its not much darker. At 11DPO your test would look the same as 10DPO.
Also, if its with ICs, they aren't good for progression lines. FRERs are typically good for progression lines, but I wouldn't expect your lines to be very dark at all at 11DPO. I would wait another day and test again. If there is still no difference from 8DPO-12DPO then I would ask your doctor to do a blood test to check how your levels are rising. Hope this helps!