My girlfriend and i had sex with condom after we had sex i check the condom if its have leak so i fill it up with water and there's no leakage is she going to pregnant?

No: It sounds like the condom was used properly and there should be no significant risk for pregnancy. In these conditions the failure rate is estimated at 2% and that can go up to 15% in case of technical failure. Next would be for your girlfriend to use oral contraception if pregnancy is to be avoided at all cost and to prevent the related anxiety.