My friend cut her finger, she started bleeding real bad, I kinda panicked and stupidly put her finger into my mouth. :| now, I'm worried that it might have a negative effect on me as our blood types are different. My blood type is 'B negative' and her's is 'AB positive' Is it a problem?
Nope. You could drink animal blood, like the Maasai, and have no reaction.
no, however, if they have any blood-borne diseases, like HIV, you are at risk of getting them
You run the risk of vampirism, otherwise no. If you start to sparkle, see a doctor immediately.
errrmmmmmmmmm................
Don't worry. People do worse than that all the time. It shouldn't have an effect.
Pray she doesn't have STD or any other diseases. You will either turn into a vampire or become batman.
As far as blood groups go, there's no problem at all. Her blood will have gone into your stomach, not your bloodstream. (People eat rare steaks all the time, right?) Babies can be created by two people with different blood groups too.
What you did isn't such a good idea, though, as you could get HIV or some other blood-borne disease from someone else's blood. Chances are you'll be fine though.
Next time, get your friend to suck on her own cut finger. Saliva is a natural antiseptic, so it does help!