I just had unprotected sex in a heat of the moment and didn't ejaculate. I was wondering what the chances of conception would be. My period ended like march 2nd

Did you mean that who you were with didn't ejaculate inside of you? If he pulled out, or even if he didn't ejaculate at all, there is still a chance you could have been impregnated.

Unfortunately the only thing you can really do is wait at least 2-3 weeks before either taking a test or really making any assumptions at all. Sorry! I know the feeling and it is completely nerve-wrecking.

The chances of conception aren't incredibly high, but there IS still a chance and I want you to know that.

It can still be a nice heat of the moment thing even with a condom!
OR, think about birth control/other forms of female contraception. It's a good idea, I promise!

There is a chance, less if the man did not finish inside of you, ( you climaxing has nothing to do with it) But all you can do is wait, really need to wait 14 days after your next period date ( if you miss the next period)

Any time there is penile insertion there is the risk of pregnancy. That risk can be reduced, but not eliminated. There is no way of calculating the odds because it only takes one sperm to fertilize an egg.