Risks derived from ovarian stimulation include:
- Ovarian hyperstimulation syndrome
- Multiple births: in cycles where two embryos are transferred, chances for a twin pregnancy are 6%. In cycles where three embryos are transferred, chances for a twin pregnancy are 6% and chances for a triplet pregnancy are 3%.
Risks derived from pregnancy include:
- Miscarriage: it is estimated to occur in between 20-22% of the cases, being more common during early pregnancy.
- Ectopic pregnancy: according to statistics, 2 or 5 women out of every 100 women undergoing in vitro fertilisation may have an ectopic pregnancy. In natural conception, its probability may reach 1% up to 1.5%.