yellow selections for cocktail

What causes Yellow discharge?
Hello Mommies. I have been having lower back pains,abdomen pains,sore nipples and I eat alot lately. So about couple of weeks ago,I took a HPT (Home Pregnancy Test) and was negative. Then all the symptoms persisted and I took another yellow selections for cocktail
HPT last week Wednesday and was also negative. So now,I have Yellowish discharge everyday on my ... was even darker and alot,to a point that I thought I was getting my periods. To my surprise it was Yellow discharge(no longer
Yellowish but YELLOW). What could be the caus
or what's wrong with me??

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