BFN @ 12dpo, but preg symptoms?

Got a BFN this morning (with FMU) and 12 dpo. But I feel like I have a ton of symptoms!
-Sore breasts (to the point that it wakes me up)
-cramping at day 6/7dpo
-nausea & loss of appetite
-upset tummy a few times
-heavy CM since 9dpo (abnormal for me)
-mild, abnormal-feeling cramps 11dpo
-insomnia & odd dreams
-feeling hot, especially in my face (normally I'm always cold)
Any advice, or am I just sick/crazy? It is our 2nd month TTC and I used an opk this time.