I am in need of some opinions. This post may be TMI, so I apologize in advance. I have been taking the same birth control for about 2 years now, and have never missed a period. Sometimes my periods are very light, but it's always noticeable that I'm certainly on my period. Last week, I was supposed to be on my period, but did not really bleed. There was one day when I wiped after using the restroom and there was a tiny bit of darker blood, but that is all. I never bled after the fact or anything. My breasts were swollen (as usual) the whole week I should have been on my period, and now they have gone back to normal size. I took a pregnancy test two days after when the end of my period should have been, and it came back negative. This week I have been constantly hungry, gassy, and I constantly want to have sex. I also find myself extremely exhausted constantly. I am a student, but I haven't felt this exhausted in a very long time. Am I just over thinking things, or should I take another pregnancy test? I know that sometimes there can be implantation bleeding (when the egg implants itself), but would it really happen when my normal period should take place? Please let me know what you think.