Pituitary hCG: While hCG is produced by the placenta, sometimes, it is also produced by your pituitary gland in your brain. The pituitary gland secretes various hormones that help to control your endocrine organ systems (such as reproductive organs, thyroid, pancreas and more). The pituitary gland secretes three other hormones (the thyroid stimulating hormones, the luteinizing hormone and the follicle stimulating hormone), which are very similar to the hCG hormone. If your hCG is indeed secreted by the pituitary gland, the levels will not increase the way they do if you are pregnant.
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