I'm at 5 dpo & I'm wondering if these "symptoms" are in my head? Help please!?

It's hard to say for sure but that fact that your are having on ovulation dates is a great. I did not feel any symptoms with any of my children that quickly but know women who noticed a difference right away. Try to relax your mind because I know when your trying to concieve you tend to hone in on your body and notice things more that may have always been happening but never really noticed before "trying". I have my fingers crossed for you, Good luck!!