Hunnie, read some of the posts in the ttc section of this forum. Loads of us in there know our bodies inside out, we know the exact time to have sex, we know how to do it, we're doing everything we can to get pregnant, but it's just not happening.
It's actually very difficult to get pregnant, and very unlikely that the one time that the condom split was your fertile time of the month, so please try not to stress out over it. I know that's easier said than done, but there's really no point worrying until you're sure.
Like the others have said, wait until the day your period is due and then test if it's not turned up.
Do you happen to know when your next period is due? That may help to work out if it's a possibility as well.