What's that smell?

OMG!! Well in about a few weeks our house is going to wreak of rotten eggs! The girls have this habit of taking off the vent covers and playing with them. They have put balls down them a couple times. Well today we were decorating eggs. We were going to dye our last egg when I told Annika to get it off the kitchen table and bring it to me. Well she dropped it and the son of a bitch rolled under the table and straight down into the heat duct! We tried sticking the vaccuum hose down in there but we couldn't reach it. God only knows where that thing is. I was furious at Annika and yelled at her, which I regret now. But she got over it in a hurry thankfully. I know it wasn't her fault and that she didn't mean for that to happen. So know I don't know what to do. If anyone has any ideas please throw them out to me. I am thinking of calling a duct cleaning place this week and see if they can maybe find it and get it out. I don't know. Only me this would happen to. As my auntie Carol says, " If I didn't have bad luck I would have no luck at all." Anyways, HAPPY EASTER!!