Oops, I may have goofed!

Get a couple of cottonballs, wet them with warm water and wipe the kitten's bottom gently. This will help get the hair out of the way (imitates a mother cat's tongue so it's not that surprising to the kitten) and you can get a better look. If there's a pink oval with a slit in the middle of it, that's a girl. If there is a round furry mound with a dot in the middle of it that's a boy.

Actually, if you have two girls, you'd be better off looking for a home for one of them. Behavior wise, the best combination is any number of neutered males (as long as they are neutered before reaching sexual maturity is 'fixed'--meaning that the sex characteristics of jowls and shoulder musculature have been present long enough that lack of testosterone from neutering will not make them disappear) but only one female. Multiple females is not a good idea...the Chinese ideogram for trouble is 'two women under one roof' and that applies not only to humans. I've seen it in my cats and dogs all my life. The 'boys' don't fight (if neutered) but the 'girls' are constantly bickering and drawing blood, whether spayed or not.

It's cheaper to get a male neutered than a female spayed, the surgery is much less intrusive and there is much less likelihood of infection.

There is a reason that 'intact' female cats are called 'queens'. They are divas, royalty and expect to get their way right now, thank you very much--at least in the way they react to other cats. I haven't noticed that spaying does much to alter that attitude....I've lived with over 50 cats in my life and worked as a vet tech for a number of years. (A lot of opportunity for observation...)

"It would be really nice if Mercy is female because then I don't have to think about them spraying or reproducing," Assuming you get the females operated on?
Females reproduce ;0)

We had a litter of kittens that were so furry it was difficult to determine their sex. One friend adopted one named it Manny and discovered it was really a Manuela.

glitter-graphics.com

It's a good idea to get the cat fixed no matter what gender it is. There are plenty of cats out there already.

People, do you not understand that if there isn't a male to impregnate them, they can't reproduce. These are indoor cats. They don't mix with other cats. They have no chance of reproducing and I already said that if Mercy is a male, I'll be getting him fixed. I told you already that I don't want any more cats. Don't you think I have enough sense to keep the female away from a male? However, right now, I am making $8.50 an hour and I have no transportation other than the bus so I am in no position to be paying for multiple surgeries or running around to vets. I will do what is most realistic for me. Unless someone wants to volunteer to help me out, I don't need a lecture on spaying and neutering.