I am just sick with stress! I won't know if my babies have heartworm until 6 months from now, because it takes that long for the worms to develop enough to read on a test. I am just sick. I feel like I have abused them, but there's nothing I can do now. I am just disgusted at myself for forgetting their preventitive. Thanks for the kind words everyone. If they do have heartworm I may just die of a broken heart though