Amniotic fluid, possible tmi?

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How do you tell the difference between amniotic fluid and pee? I was just dry heaving really hard and some fluid came out of me. I thought it might have been pee, but it didn’t smell like it and I was wearing black underwear, so it’s not like I could see what color it was. I’m 36+4 and currently paranoid about it bc I’m a ftm.