Pill.

Sarah • 18 years old, alternative girl. Beauty therapy student. Happily taken and in love.
I'm on the mini pill so I don't take breaks or have periods regularly, maybe just spotting here and there...
I've also been taking antidepressants a while now.
Basically, I've been feeling really low and paranoid about everything this past week and I can't put my finger on why... I've taken two pregnancy tests (two weeks apart to make sure) and they're both negative. 
Does anyone have any suggestions into why I've been so emotional? Because my pill and my antidepressants have helped my mood massively, so I can't explain why I'm so depressed.
Thank you