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When I was testing for my 3rd, my lines weren't dark either. So, I went to my Dr, and she confirmed it before I called my OB.
They are getting darker. You shouldn’t check everyday as it doesn’t give an accurate account for what’s going on. HCG doubles every 48+ hours. You also need to continue to test with the same brand every time if you’re going to compare. If you look at 9DPO and compare to 11DPO, the line has gotten darker.
HCG only rises every 48-72 hours. So testing daily makes it so difficult to see what’s happening. Urine also becomes more dilute as the day goes on so comparing AM and PM samples will also make it hard to see what’s happening
I don’t retest once I know I’m pregnant. If would scare me if lines got lighter. I’ve seen a lot of women on here retesting once confirmed pregnancy
I don't know how many days post ovulation I was when I got pregnant but mine didn't get darker for almost a week. I'd also say the first response ones 10dpo is darker than 9