Here you go......
Week of gestation percentage likelihood of miscarriage
1-2 (you do not know you are pregnant)
75% (this includes eggs that never grow past fertilization, and it would have been impossible to know you were pregnant; after implantation, which occurs 7-10 days after ovulation, the odds go down to 31%)
3-6
10% (after home urine test is positive at 14 days post ovulation when hcg levels reach 50-80)
6-12
5% (or less if heartbeat heard)
2nd trimester
3% (considered stillbirth after 20 weeks)
3rd trimester
no longer considered miscarriage once fetus is beyond one pound (500 grams) around 24 weeks gestation. Stillbirth rate is 1%.