My doctor gave me through rubella vaccine and chicken pox vaccine at the same time. i read on some fact sheet that it shouldn't be. is this ok?

Sure, no problem!: Most vaccines can be given together. For example, the routine kindergarten shots are: measles/mumps/rubella, chickenpox, polio, diphtheria/tetanus/whoopingcough . . . Which equals 4 injections (2 in each arm) at the same office visit.

It is ok: You can give it on the same day but administer it on two separate limbs.

Yes: These can/should be given on the same day to avoid an unnecessary extra visit. If not done on the same day they should be at least a month apart.