I passed through icsi procedure 8 time but evert time failed ,this last time today is day 13 after ET,my urine report is negetive again,two days before on day 11 i gave bloodsample for beta hcg,it was also negetive,but my periods did not started uptill now,my docter said to continue use of progestron (internal medicine)dr said sometimes implantation appears late,so plz plz tell me is there any chances for me,if have then how many??????plz reply me soon,today is my day 13 after ET,