Hi! I am 38 years old and am trying to conceive a second child. My cycle is like clockwork, but this month I am two weeks late. I have had minimal symptoms...mostly fatigue, headaches, increased sense of smell, and bloating. I had implantation bleeding with my first son. I had a pin-size spot today, which I thought was implantation bleeding. Now I am having brown blood. Oh, and so far tests have been negative. What's wrong with me?