Late period

Pali
Haven't got my period for a months now n I'm not pregnant 
Took a pregnancy test no the5th month and I wasn't and This Couple months my bf and I haven't used comdom n he always pulls out after words we use condons.
N this 3 month I have been feeling depress, sad, hipper, horny, headache, tired,lazy, active, sensitive, angry, my back hurts,the upper of my vagina hurts, & I gain 16 pounds the last 5 weeks 
What does this means????

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