I'm on Ortho Tri-Cyclene and currently on the placebos of my second cycle. I have not gotten my period yet, but have spotting and cramps. Pregnant?

Maybe not, but... Can do a pregnancy test if worried. A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon.