Hi, I am on my 18 day post embrio transfer ( 5day blastocyst). Since my first beta HCG test, I got positive result (Day12- 212, Day14- 660, Day16- 1963, Day-18- 4633.8) , results looked pretty good but I am worry because today (day18) I had a small bleeding , like a medium blood clot. Is it normal?, It would be any possibility of miscarriage? Thank you for your help. Jany