You can take a break from IVF anytime you want. It won't hurt anything, since each month is a new chance to get pregnant. I do not know the success rate of a second round of IVF. It may depend on timing, embryo quality, etc. You can also pose your question in the Fertility Forum, found here:
http://www.medhelp.org/forums/Fertility/show/96
These ladies have a lot of experience with IVF and may have more information and experiences to share with you. Good luck! And please, if you need to take a break allow yourself. Go have fun and go on a mini-vaca with your hubby.