It's possible to get pregnant as soon as you stop taking it. Most Doctors will recommend waiting until you've had a normal cycle before you start trying though. Good luck! :)
The generic name for Jolessa is Levonorgestrel/Ethinyl Estradiol. It is used for prevention of pregnancy. It is basically a progesterone and estrogen combination which prevents ovulation.
You can become pregnant if 2 or more doses of Jolessa are missed. Timing is very important when it comes to this drug. If you start your pack later than the proper day, you can get pregnant.
The effectiveness of this drug can be decreased by certain other medicines which includes antibiotics, seizure medicines, vomiting, diarrhea etc.