I had sex a couple of days ago and the condom was very loose and kept slipping off, and he came inside me..is there a possibility i could be pregnate?

Yes: Condoms are only effective if they prevent the semen from entering the vagina. If he ejaculated inside you, you are at risk for becoming pregnant. If you also take birth control pills, this risk is considerably lessened. Emergency contraception (i.e. - Plan B) is available over the counter and can be effective at preventing pregnancy if taken within 5 days, though the sooner the better.