Is it possible to be pregnant with a negative test

Hi girls so my cycle is roughly 27 days and I’m currently on day 43! I’ve never been this late before but I’ve been testing and I got negatives, I haven’t tested again in a week now, I’ve been on metformin for 4 months now and my cycles have been regularly but this month I’m not sure what’s going on I don’t really have symptoms expect just always having a cold that comes and goes and sneezing every day for the past couple weeks and always constantly have white clear slippery discharge when I go toilet but negatives test, is it possible to be pregnant but just not picking up on a pregnancy test right now? I’ve heard stories of where some women don’t test positive until they are couple months pregnant but not sure if that’s true, has that ever happened to you or someone you know?

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