Swimming following IVF treatment is not recommended at all during your pregnancy due to potential infection risk. However, once you have reached your 12 week gestation mark, and, if you feel that you want to swim, you are recommended to contact the doctor who is looking after you during your pregnancy and ask them to advise on the development of your pregnancy and if they feel that swimming is suitable and safe for you. It is then at your own discretion if you wish to go swimming.