Hello and welcome, The weight gain may be due to ova shield or the injection. The follicle was big and injections caused its rupture and also a high in the hormone levels. This lead to the weight gain. It is called ovarian hyperstimulation syndrome. It may resolve by itself but may progress before going to the resolution phase. Next symptoms if it progresses include abdominal distension, bloating, shortness of breath, palpitations and many more. Please see your doctor and check if you need supportive treatment. Admission may also be needed in a small number of cases. So please see your doctor and get evaluated about your condition. Hope this satisfies your query. Thanks for using HCM. Feel free to ask any more questions that you may have. Dr Madhuri Bagde Consultant Obstetrician and Gynecologist