Ovarian hyperstimulation syndrome: The ovaries can swell, leak excess fluid into the body, and produce too many follicles, the small fluid sacs in which an egg develops. Ovarian hyperstimulation syndrome (OHSS) usually results from taking medications to stimulate the ovaries, such as clomifene and gonadotrophins. It can also develop after IVF. Symptoms include: bloating constipation dark urine diarrhea nausea abdominal pain vomiting They are usually mild and easy to treat. Rarely, a blood clot may develop in an artery or vein, liver or kidney problems can arise, and respiratory distress may develop. In severe cases, OHSS can be fatal. Ectopic pregnancy This is when a fertilized egg implants outside the womb, usually in a fallopian tube. If it stays in there, complications can develop, such as the rupture of the fallopian tube. This pregnancy has no chance of continuing. Immediate surgery is needed and, sadly, the tube on that side will be lost. However, future pregnancy is possible with the other ovary and tube. Women receiving fertility treatment have a slightly higher risk of an ectopic pregnancy. An ultrasound scan can detect an ectopic pregnancy. Best Fertility Care Centre .Advanced Fertilty Care Centre , Ashwini Multispeciality Hospital & Fertility Care Centre Moondrumavadi K.Pudur Madurai-07 , Maternal and Child Health Care.