Pregnant?!?!?

I didn't know where to post this. But my period is now a week late and I've been seeing pregnancy symptoms like extrem tiredness I have to have a mid day nap, crazy bloating, nausea to the point I think I will throw up, dizziness, I want random food especially potatoes and ice cream, abdominal cramps, and now the late period... What's the chances I could be pregnant?? We use withdrawal method and I'm on birth control pills ( noriday/micro pill) but have never been good at taking then. I know the only real way to tell us a home pregnancy test but there expensive here so I kinda don't want to waste it if the chances are slim. What do you guys think?