I am 21yrs old and had protected sex a day ago , after that it bled and pained in stomach . Aftr 1 day the pain is still there and little bit bleeding also. I mean is it okay?

First the bleeding is normal especially if it was your first time. If it doesn't get better I'd consult with your GP or even go into a chemist and ask. For the sore stomach I find after having sex with my partner my stomach feels sore and tender, it can sometimes mean the penis has just gone in too far and is hitting something inside your stomach. As uncomfortable as it is, it will get better. Once again though if it doesn't consult your GP. Nothing too much to be concerned about though :)

it can sometimes mean the penis has just gone in too far and is hitting something inside your stomach.
This is not correct. Your stomach is not part of this area, is in an entirely different part of the body much higher up, so the penis cannot "go into" it. If anything, his penis can bump up against her cervix, but cannot go past that into her uterus.

This is not correct. Your stomach is not part of this area, is in an entirely different part of the body much higher up, so the penis cannot "go into" it. If anything, his penis can bump up against her cervix, but cannot go past that into her uterus.

Sorry not stomach your cervix. It can cause pain and can be extremely uncomfortable as I've experienced it before.