False pregnancy is not likely as spaying should prevent that from happening. It would probably be best to ask your vet about this and schedule an examination if your vet believes that would be a good idea. He said I described her as being in heat. I guess I just want to make sure. Rolling on the floor and rubbing against objects with noticeable intensity occurs.
Cats often rub their head or neck on objects as well.
Flexing the claws and stretching may accompany the rolling. As estrus progresses the female starts a strange howling that can go on for several minutes at a time. Some females spray urine in the same manner that is usually associated with tomcats - lifting the tail and squirting urine on a vertical surface. She may adopt postures suggestive of a desire to mate - tail raised, rear end elevated. A strong desire to escape the house may develop.