Back in June, my husband found two 5-week old kittens tied in a pillow case and dumped on the side of the road. They were both female and are now in heat. But it seems to me that the heat doesn't want to end. One comes in then goes out in time for her sister to come in and go out in time for her sister to come in again. The first has now "gone into heat" for the third time. Is this normal? And how long does this go on? We are going to spay both of them, but can't do it at this moment. My sanity needs the answer to this one. Basically I have two cats in heat and I am going slowly - out - of - my - mind.