Pms or Something Else?

Since I don't have my speculum handy, I think you should talk to your doctor. You don't ovulate when you take birth control. That's not how it works. The hormones in your BC suppress ovulation; they don't allow it.

My suggestion would be to talk to a doctor if you are having serious pain. It's your body telling you something is up. You may also have appendicitis, psoas muscle pain, an ovarian cyst...? Who knows? I had all three, and I found a doctor to be necessary in diagnosing each one. I'm not saying that you could have any of these- I'm saying a doctor actually examining you is better than the internet.

Have your doctor check it out.
Could be your appendix.

How is it today?

Could be a blocked BM. That's generally on your right side. If it's abnormal for you, I would assume that's what it is.

Pain radiating down to your toes could be something pressing on a nerve - that can happen if the blockage is pressing on nerves (that connect to other nerves, like down your leg).

That would be my guess. But of course, if it persists or gets worse, definitely call your doctor. They would have the right questions to ask. I find usually a quick visit or call and they can ease your concerns. By asking the right questions, they can rule out the serious stuff (like Appendicitis, etc.)

I wouldn't risk it myself. Good luck :)