so, got a bfp yesterday in the evening and this am was retesting expecting a darker line, and it was nearly a bfn. Went to the ER, they did a transvaginal u/s saw a cyst on the right overy and my quant HCG is 13. They don't know if this is going to result in a viable pregnancy or not....any thoughts? I went and found a chart that said for how early I am, (the intercourse caused this pregnancy was 2 weeks ago-today-) that it's within a normal range to be at 13, but still scared, had some spotting 3-4 days ago which I took for my period but now I realize was implantation. Why would the first response be lighter this am?