8dp5dt BFN... is there still hope?!

ER was on 1/28.  11 eggs retrieved.  11 eggs matured.  ICSI all 11.  9 fertilized.  ET 2/2 two blastocytes both grade AB.  None of the rest made it to be frozen.  Ive been feeling crampy, moody, exhausted, headaches coming and going...  but I dont know if that is pregnancy related or if it is from the Estrace pills and Endometrin suppositories.  My beta is tomorrow morning.  I had a dream this morning I took 3 hpt's and they were all positive......  so when I woke up I was naturally feeling rather optimistic and used a First Response test....and it was a BFN.   Is there any hope to be had?!  Have any of you had a BFN at 8dp5dt then a positive Beta the following day?!