I have a really cool app on my phone that can detect the baby's heartbeat. And up until today I was only hearing what I thought was one.. this morning I listened again and it sounded like I had either one that was crazy fast and all over the place or two that were interfering with each other.. not sure what it sounds like. I am much bigger this time than ever before and twins run in my family. I am 16 wks and 3days and I am showing like I was with my other 3 at six to seven months..... help!!!???!!!