I was on contraceptive pill December to February, and got sick, so I took antibiotics. Then after that, I had my first depo shot last march, I started taking diet pills (Chinese made) while I'm on depo, last month, (april) I started feeling feel sick and nauseated. Spotting brown to light red for a month (april to may), tired and sleepy. Cramps, lower abdomen and left side of my hip. And I feel like my linea nigra which I got from my first pregnancy got darker and noticeable. I have taken 4 pregnancy test this may, and they are all negative. What is happening?