Something wrong with my cat, please help!!!

Hi, there's something wrong with my cat, Mitu, and I am trying to figure out what it is.
All this started about 2 days ago, he got out of his litter box and he started limping of his right, back foot. I noticed he had some pee on it so I thought that was bothering him. I cleaned his foot and he was ok after. Yesterday night I noticed the same thing, again after he got out of his litter but this time there was no pee. I followed him into the bedroom and he was fine.
Last night tho, I woke up at the sound of him trying to get into his bed, I didn't really saw what he was doing but as soon as I said its ok, he jumped in the bed and felt asleep with me.
This morning he first pooped, when he got out, limping again, just a bit. Then, he went to pee, he peed, he cleaned the litter and when he got out again, he started limping but this time he started doing this movement of going backwards and forwards and then to the ground like he was scared of something. I said its ok Mitu, and then He calmed down a bit. So, now that I think about it, it was the same movements he was doing last night. I picked him up and I start touching everything to see if he crys when I do it. I looked at his toes, legs, back, neck....he doesn't cry at all when I touch him, I even brushed him and he didn't say anything besides purring like the usual.
Now, besides this he runs thru the house, he playes, eats, drinks water, everything else seems normal.
I can get to the vet on Friday or Saturday, I called them and they said to keep an eye on him and that it shouldn't be an emergency...but I want to figure it out what this can be.
Can anyone help me? Is this something I should worry about, any suggestions on what I can do or check?
Thank you.

You've got a real mystery there, the only thing I can think of is maybe when he goes to the bathroom he strains something, or maybe the position of going to the bathroom hurts something in his leg or hip. I would try to get his behavior on video on your phone, that would help the vet tremendously and maybe you could even take it in now for them to look at. A vet would really be the only way to find out what is wrong, especially in case it is something with his muscles or nervous system. All the luck, and keep us posted!

how old is your cat and how much does he weigh?

He is 3 and I don't know how much he weighs...but he is pretty big.

I don't have a good pic of his body. Is this because he might be to fat???

Oh!  He's adorable .  He doesn't look fat in the pictures, and I've never heard of something like this happening even to overweight cats, at least not to a cat that might be pudgy, and I don't even see that in these two pictures.

I also have no idea what it might be, but hopefully your Vet will find something, if in fact there is still something amiss by Friday.  It might just be a little strain that only presents itself when he gets into a certain position, as Di and Bob suggested.

Yes, I will keep an eye on him and see what happens this days. Thank you.

This my sound stupid, but can this be a start to a urinary infection?
He pees 2 times a day, never saw him having a problem with it, but I don't know

If the pee volume hasn't changed, then it's unlikely that a uti is the cause. I'd say that di and bob has hit the nail on the head - its most likely related to hip or leg pain. If, for example, he gets a muscle spasm from squatting then it would hurt at the time, but when the spasm stops the pain goes away. Think of what a cramp feels like to us. A vet check is a good idea anyway, just to be sure it's nothing that needs treatment. Videoing the behaviour is a great idea too - a picture is worth 1000 words. Hope things go ok on Friday

Columbine said:

If the pee volume hasn't changed, then it's unlikely that a uti is the cause. I'd say that di and bob has hit the nail on the head - its most likely related to hip or leg pain. If, for example, he gets a muscle spasm from squatting then it would hurt at the time, but when the spasm stops the pain goes away. Think of what a cramp feels like to us. A vet check is a good idea anyway, just to be sure it's nothing that needs treatment. Videoing the behaviour is a great idea too - a picture is worth 1000 words. Hope things go ok on Friday

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I see, thank you yesterday night he peed and everything was normal, he didn't limp or anything so Ill continue to watch him and have my phone ready also.