I had my mens last month Jan. 11 to 17, 2016 and sometimes it comes on 13. Sometimes advance sometimes late. I had sex with my boyfriend Jan. 24, 2016 (its withdrawal) I saw it! And it only happened ONCE. I had spotting Jan. 25 to 29, 2016 its 4 days.. the color is close to red but brown. I don't have any idea why is that. This Feb. 11 and 13 my mens didn't came and I took pregnancy test twice it clearly says negative. I did my test Feb. 12 and Feb. 16. I don't have any symptom but people notice that my hip is getting larger. Weird. Please answer me. I don't want to be pregnant.