Protected sex 3 days after my period. the condom was loose. when he finished it was all over the condom. he pulled out carefully. could i be pregnant?

Unlikely ....: ... but theoretically possible in the sense that pregnancy can occur any time no contraception is used. This would have to be considered "unprotected" sex if "it was all over the condom." But it is very unlikely that you would have ovulated just 3 days after a normal-cycle period. I would expect next period at normal time. If not, do pregnancy test. Pursue more reliable contraception:)

Pregnancy possible: Conception often happens when we least expect it under ideal conditions, which is normally midcycle day 11-14. Your description points to a less fertile phase of menses but a broken condom always raises the risk. Definitely consider an early pregnancy test in the next 2-4 weeks if you are concerned and of course mention to your doctor the additional risk of std's with unprotected sex. Good luck