If i pull out then ejaculate beside her and put it back in her after releasing the sperm immediately then continue penetrating in her for a few mins while there is sperm left on it and around. what r the chances of pregnancy? we want it to occur?

Confusing. You want pregnancy to occur? If sperms are present on the penis on reinsertion then there is always a chance of pregnancy- no one can predict any numbers for the chances.

Any small amount of sperm, no matter how small is capable of causing pregnancy. If you want pregnancy to occur than have a normal ejaculation in her vagina. If you change your mind than practice safe sex.