What Are The Side Effects Of Masturbation After C-section?

Hi, I had my first child by c-section 4years ago, now i am into my ninth month and have my c section again day aftrt tomorrow.i.e, 18th Feb. My question is, since 2days i am getting desire for sex a lot n doctor had advised me not to have sex since 7 th month ad i had urine infection. Can i masturbate myself? will it risk my child or will it get urnie infection. please adivse.