Should I be worried??? 7 days late 20dpo

So I finally got a vvf bfp yesterday on a wondfo hcg test and confirmed it on a clear blue digi that was a bfp as well estimate 1-2 weeks.Im starting to feel paranoid because some are saying it shouldn't be that light for 20dpo and that it can be a sign of a miscarriage in the making or chemical.I did however retest today but with not fmu and it did come out just slightly darker but not a big difference.I did ovulate a bit later than my app predicted.Could it also be that I may have implanted late and thats why my test sticks aren't so dark yet?