You can ovulate on the Pill, but the BCP will suppress your signs of fertility - so no, you can't really chart. I mean, you can for practice, but it likely won't tell you anything.
If you have any NFP questions, don't hesitate to drop on by the NFP/FAM board. Charting to avoid and charting to conceive are a little different. The easiest way to learn NFP well is by taking a class (in person or online).
Here's some information about how to track fertility with the Billings Method, which is one kind of NFP (there are lots of kinds.)
http://www.woomb.org/learningBOM/B20...nstruction.pdf