I was just watching the news and they had a story about a Long Branch couple who did IVF. 3 embryos took and then one of the embryos split and they ended up with quadruplets. They didn't find out about the 4th baby until later on in the pregnancy. Surprisingly the mom carried all 4 babies until 35 weeks. One of the DRs on the news said in IVF there is a 3% chance of having a split embryo. Interesting!