I just started a job so I will have money I just have stuff I need to take care of at this very moment so I have no extra money. I understand a baby is expensive. Trust me I do know that.
Quitting smoking can effect your menstrual cycles, so try not to worry too much about this. Stress can also effect your cycle. You can buy home pregnancy tests at the dollar store, and those are just as accurate as the other tests. If you are not on some form of birth control, then you really need to do so until you are actually ready to have a baby.
You can't afford a pregnancy test? They're $1 at the store---as for if you are that's easy. If you're sexually active, YES it is possible. Beyond this though, we can't say anything.
If you can't afford a test however it might be wise for you to reconsider sexual acts as a child costs 100x more than a test ever will.