My wife and I had intercourse. After I ejaculated, I wiped myself off, but had a little precum left and she gave me oral real quick and we got into it again. Is it possible that she can still get pregnant?

Absolutely. Why would you think not?

Yes, it's not the most efficient way to become pregnant, but it's possible. There can still be some semen/sperm left from the previous ejaculation. She'll just have to see what happens when her next period is due.

Any time there is penile insertion there is the risk of pregnancy.

Are you trying to conceive? If so, you may want to re-think how you're doing things. Not the best way to get pregnant, but yes, it's totally possible. If you put your penis in her vagina, even with protection, pregnancy is possible.

Of course, that is how pregnancy happens.