If you are not using any protection and you stopped taking depo. all the way back in Dec. then your chances of getting pregnant are really high, especially if you are sexually activie near your days of ovulation which you are since you said every 2-3 days. You need to take a test and see if you are pregnant, use your first morning urine and follow the directions as followed, and stop smoking yesterday! Plus get on protection, you are so young, have fun and worry about having babies later!
No Protection what so ever. I stopped taking depo and it wore off by december. Not sure if that makes a difference.
The smoking is probably not going to affect you getting pregnant. But if you are trying to get pregnant then you need to stop smoking because it is horrible for a baby. You also didn't mention if you are using protection or not and that would have more to do if you get pregnant or not then smoking.