Anyone fall pregnant after successful ivf?

After having all the tests with no outcome of what the issue was, why we never fell pregnant naturally we tried 3 iui with no joy, then went on to ivf after 1 fresh and 1 frozen cycle we felt like giving up. On our 2nd fresh cycle we were overjoyed and in complete shock that finally we had the lines we had been waiting for. Our 6 week scan showed 2 little blobs. Unfortunately only 1 with a heart beat. We welcomed our baby girl back in June 2012. Since then we have been hoping that it would kick start my body and fall naturally. So far not the case. We would love to have another child but we can't afford the ivf, has any one had this happen to them?? I suppose I'm just looking for someone to say it does happen and it could happen to you.