Ovulating on birth control

I got put on birth control by my doctor to regulate my period. I don't take it to prevent pregnancy. It has made my period come every month thanks to it but the thing is I don't take the pill everyday I forget and I take it every other day or every two days. I took an ovulation test because I was curious if I still ovulated since I didn't take it everyday and it came back positive. Is that normal since I don't take the pill everyday or is the test wrong??