It's 3 weeks after I first started taking birth control and now I have painful stomach cramping?

3 weeks ago I started taking birth control, and it wouldn't usually give me cramping but for the past few days I've been having these awful cramps. It's not period cramps. I don't know what to do. See I'm 17 and my parents don't know I'm on birth control, because I went to a free clinic around my area. The pills are called ortho tri-cyclen lo

Nancy2013-07-09T10:30:00Z

If you started three weeks ago then your period is due this week. You should have 21 active pills and 7 placebos in your pack.