How Long After Taking Pills, Periods Can Be Expected?

I am 20 years old and 115 pounds. I have no medical history but i have been on birth control for a year now. I had my period on april 5-8 and then started a new pack of lutera. I stopped my birth control 3 days after starting and then I had a withdrawal period 3 days later on april 15th-19th . When would i ovulate?