There are no studies or report showed that Vyvanse can decrease your chances of getting pregnant. It can be because this drug does not positively or negatively affect your ability to conceive. However, if you are planning to get pregnant, you should talk to your doctor before taking this drug.
Although there are no animal or human studies conducted yet regarding the connection of this drug to pregnancy, other drugs with similar effects to this medicine have shown to increase the risk of birth defects, as well as miscarriages, when they were given to women, who were pregnant, in high doses. Because of this, Vyvanse is considered as a Category C medication. This means that it may or not be safe to be used during pregnancy.
For this reason, you should tell your doctor or your healthcare provider if you are thinking or planning to conceive. Your doctor will help you understand the risks and benefits involve with the use of this drug during pregnancy. He/she may request additional tests before making a recommendation. Or another medication of this kind may be prescribed to treat your condition.
Your ability to conceive may not be affected while taking this drug. However, it may cause potential risks to your unborn child. It may also cause miscarriage.