my cat is pregnant and she has ear mites

hi my cat is 4 weeks pregnant and she had ear mites before and i took her to the vet and they gave us medicine and we used it and the ear mites died and now it came back again but the medicine says that its not good to use it on pregnant cat so i read that mineral and olive oil is fine for cats but i don't have mineral oil so i used olive oil for my cat yesterday but do i do this everyday or every 2 or 3 days help ?

Olive oil is fine. A working home remedy for not so difficult mite attacks.  Them drown and suffocate in the oil. A couple of drops is enough, dont drench the whole ear.

How often?  Stands still in my head, I suppose enough with the second variation you said.

Did she got dewormed too?

should be, round worms can go from mom to kittens.

Another tip is Revolution, nowadays prescription free. (just be sure it is dosage for cats, not dogs).

Revolution takes all outward parasites, and most invard too, save tape worms.

Keep us updated and please do ask!

Good luck!