Ok, let me put it this way.
As you are right now, with no birth control and assuming there are no big accidents, then there is about a 20- 30% chance of pregnancy maybe a little more. It's really not recommended for guys who can't control themselves. There are ways to reduce this to about 10-15%, but that’s still incredibly high and probably increases the more you have sex.
If you were to start using condoms or your partner started to use birth control pills for an entire year, your chances of pregnancy would be about .01-1% with typical use of condoms and birth control pills.
Do you need help learning about birth control ? What's stopping you from using it? -- I'm just curious, your attitude about possible children is... strange. How old are you?