But if you are really keen I think many IVF clinics have a free consultation you could go to and they would give you the facts, even your OB could probably tell you
You can't get referred to an IVF clinic for 'twins'. You need to have fertility issues. Thankfully all the FSs i have seen are very committed to maternal and baby health and generally support single embryo transfer. As medical advancements are made, there is less and less need for putting more than one embie back, as success rates are on the improve.