M.H.
I don't think you will find anything that is completely foolproof but, I use what is call the Instead Cup. You insert it like a diaphram and it collects the blood from your period. You only have to change it like once every 12 hours or so and I usually only have to use a thin pantiliner on my heaviest days along with it. It is worth a try. I usually buy the cups at Wal Mart but, it may depend on where you live. I think you also may be able to find them online somewhere if all else fails.