I used to have crippling pains pre-Oscar and post-depo provera. It was so bad that I had to take days of work because of it: I just couldn't move. The flow itself was medium, and I was as regular as clockwork. Thankfully, it never lasted longer than 3 days.
Now however, they're all over the place. I was on the depo for a year, and came off it last October. During that time, I had no periods at all. I went on the pill for 2 months, and that messed me up like you wouldn't believe.
However, at the beginning of the year I started the mini pill and the bleeding stopped. For some reason though, I have had AF the last two months at exactly 28 days apart, which is what my cycle used to be, with old-school period pains to boot! Go figure!