Not really sure what is wrong but it could be anything. Your question lacks details but best advice is to go see your Doctor. They would be better to serve you to find out what the issue is, if any. Sometimes the body just gets thrown off. It could happen. It does happen. I would go see my doctor, if I were you.

Sorry I left out details but its like it came on two times this month and at the begin of this month it was normal and now its like brownish and this morning its kind of dark pink but note that its just spotting and I have talked to my nurse and she said I could be pregnant because I have been very tired and every thing I eat doesn't agree with me I been feeling this way for about a week and a couple of days now

Are you on any sort of birth control? Some women will have irregular bleeding once in awhile due to hormone fluctuations.

Are you trying to become pregnant? Pregnancy is certainly a possibility. See what happens when you would expect your next period and test accordingly.

Well I was o the shot but the last time I took it was in Aug. of 2010 and my cycles came back Oct. of 2010. And yes I am trying but its not working and I have been spotting for about 3 weeks now when it first started it was brownish and now its very light red and when I say light red I mean light red I took I home pg test and it came back negative but that was about a week ago I asked my mom and she was like I'm pg but I'm not sure what I should do because the internet isn't helping me at all