Negativity Creeping In....

I know my body pretty well and, of course, at this stage I am analyzing every cramp, twinge and ache. I've had mild cramps off and on all day. My first thought was that maybe my little embie is snuggling in deep. Then, I remember, oh, I don't know what that feels like, so it must be the usual cramps of AF (I definitely know what that feels like!).  I've heard it more than a hundred times that some women think AF is on the way, then bam a BFP! I sure hope that's the case with me.  In my previous IVF cycle, AF showed (in full force) 2 days before my actual beta. I've had other friends who don't get it until AFTER the beta. Honestly, since we've manipulated my system so much, I'm not even sure when to expect it. My last dosage of Cetrotide (keeps you from ovulating) was 12/6. I've been on the progesterone since then.   I guess I'm rambling at this point, but I want so badly to believe that this is IT! But, I feel so guarded because I've been down this road so many times before and my mind is wanting to expect a BFN.  Sorry ladies, not trying to be Debbie Downer, just trying to get through this crazy 2ww.