This is known as female ejaculation aka as gushing/squirting etc. Yes, it's a normal thing to occur. You can read more on this here Click here
It's fluid from the Skene's glands. When 'non-scientific' lab tests were done on fluid produced from from the Skene's gland and during female ejaculation, it was determined to not be urine at all.
Here is an excellent site that explains what this liquid is made of Click here
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