Trying not to over think things

For me the hardest part about TTC is trying not to think about the possible symptoms. When you want a baby and your post ovulation anything that is different or that goes wrong is a possible pregnancy sign. Like this month, my 4 year old started crying and my breast became sore. I have been napping the past 4 days everyday. When I woke up Tuesday morning, I had a few drops of blood on the tissue when I wiped, and then it went away. I am constipated and wake up with a rather humbling headache everyday. Part of me wants to believe that this is it, and part of me and telling myself that its all in my head. So ladies, am I crazy, or how do you mentally detach yourself from what your body is doing? Because I keep trying not to think about it. And I have promised myself that I would not test until I am late. I need advise