Given that it's 3 days in to fermentation, that looks very normal. It's just a healthy, creamy looking krausen.
I personally do not see the need to do a gravity check on day 3 when there is obvious fermentation activity occurring, as evident in your photo. I would trust that the yeast is doing it's job and wait until visible fermentation activity comes to a stop before doing a gravity test. RDWHAHB.
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