Help with getting pregnant

My thing is when can I take a test ? How long do I have to wait ? Me and my boyfriend has been trying to conceive but I don't think it's working ... We had intercourse on Friday,Saturday and Sunday unprotected and he came in me all those days... Took a test Monday and it was a negative, I know I'm not ovulating yet but it's still a chance of me getting pregnant right? I need help idk anything about this stuff I'm just kind of scared that I wouldn't be able to produce....