Cramping, 2WW & Losing My Mind

So I'm not sure if it is from the pizza I had for lunch, possibly AF making her presence known, or a sympton of pregnancy, but I've had some cramping this afternoon.  Then I wonder is it my mind just playing tricks on me?  This 2 WW is making me feel like I am losing my mind.  I have become so sensitive to every single feeling (real or otherwise) that has gone on in my body, that I think I am starting to lose my mind!  I found this cool IVF animanted slideshow that takes one through every day of the cycle, showing what goes on inside and based on that, the 8 POAS tests I got at costco yesterday would be of no use to me until the day of or perhaps one day before the beta.  
http://www.fertilitylifelines.com/advancedtreatments/art/cycle.jsp

So, back to sitting and waiting and wondering if at least 1 of those 6 embryos transferred will attach and make it (and whether I am not losing my mind, but there's something greater out there and it's working inside of me).  The wait continues...