There is just no excuse necessary for your cat getting pregnant. She should of been spayed many months ago . And not to be blunt, but there are a few "parts" on a male cat that are very visable, gee..my cat was neutered at 4 months old and even though his "parts" are very shrunken, I can still tell that he is a male cat. Unneutered males are very pronounced since most walk proudly with tails straight up and the "parts" are very noticeable.
Please listen to what the fine folks here are trying to tell you, because if you should ever go into a shelter and see all those precious little ones(and older ones too) peering out from "death row" (as sometimes I refer to it as) cages hoping to live a life in a wonderful home but somehow knowing it may never come, if you have a heart...it will be broken.. as some of them know that they will not ever get that chance. My two were both someone else's "mistakes" and both were "on death row" and I can see it in their eyes how thankful they are to me that I saved their life, but I (as a kind hearted animal lover) feel really sad that I can not save them all it just breaks my heart everytime I drive by my shelter knowing what is going on inside...

I apologize that this is so long...but I hope it will open your eyes and see what really has happened. If you love your cat Please get her spayed soon as ok'd by the vet ,and the kittens too.