Pregnancy test line hasn’t darkened?

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Hi everyone, hope this is ok to post here. So in the last week I’ve found out I’m pregnant again, my husband and I are fairly shocked but really excited (our little one is only 7.5 months old).

I’ve been testing fairly regularly as it still feels like a dream however it doesn’t seem like the lines on these tests are getting much darker? Shouldn’t I see some progression by now?

Thank you in advance for reading/commenting! ❤️