Beta Results are In...

I took another HPT this morning, it read "pregnant." We were guarded, but elated. Since the HPT yesterday said "not pregnant," we were expecting the beta to be low. I did not know it would be as low as 10.5. The nurse said they consider anything under 5 not pregnant and anything over 20 pregnant. Leave it to me to be the confusing patient.  I am scheduled for a retest on Wednesday. In March of this year, I had a chemical pg with a beta that never got above 26. And, to top it off, AF was visible. We did not allow ourselves to get very excited and it was easier that way. With this one, we're just hoping it was late implantation and that there's still a chance to have a healthy pregnancy.  Anyone had any experience with super low betas? BTW, I am 11 dpt, but my clinic starts the 2ww from the day you start progesterone, which was 6 days prior to transfer (today is day 16). I'm confused as to why they do this.   Please pray with me for a miracle.  P.S. I took a Clear Blue Easy digital test, who would have thought it would have picked up hCG that low?!?