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I am sorry to hear you are worried about your Labrador, and I am also worried from your description.
This may not be a normal heat, but a "pyometra", a uterine infection that occurs following a normal heat cycle. I can't tell you for sure without examining her, but pyometra can become a life threatening emergency, so I would have her checked out as soon as you can. I would look at her discharge under a microscope, to see if there are excessive numbers of white blood cells. If there are, this may be a pyometra.