After a failed IVF, what's the soonest you can try again?

you could do back to back cycles but I would recommend you wait a month at least. It is hard on your body to do it back to back (I know I did 7 IVFs in 2 1/2 yrs) also when you have your post IVF consult with your RE he/she may have some other tests they want to run based on how your last IVF went. Good luck I know dealing with a BFN is difficult and having a plan in place makes it easier to get through it.