OK so a bit of a situation here… I got my male cat neutered the day before last. Then last night I witnessed him mate with his sister - just once. I have kept them in separate rooms since. She is still in heat but will remain indoors. Naturally, I’m worried she’s pregnant. I believe NOW that a male cat can still father kittens for a short period of time after being neutered… I am hoping that the fact she’s still in heat is an indication that ovulation wasn’t induced. He definitely only caught her once. I guess I won’t know for sure until a few weeks. I am hopeful that chances are extremely low she’s pregnant. But has anyone had a situation like this before?