Finally 2 regular cycles but this month...advice?

I was put on birth control around age 13 because of cramping. I did the pill for awhile then switched to depo in high school from 17 till i was 21. I havent been on birth control in 4 years. The last 2 months i had a normal 28 day cycle for the first time in forever. To continue this i should start tomorrow but i havent had my usual very sore breast this time. Can anyone relate? Advicr? Similar stoty?