I'm diagnosed with bilateral polycystic ovaries but my period are regular I have a 31 days cycle, can you please help me understand the situation.?

Normal. It is normal to have cysts on the ovaries. If you have many cysts, it could appear to be pcos, but if you have regular cycles it would not matter.
Unsure. If your periods are regular the only way you can be diagnosed with pcos is by combined ultrasound appearance and high male hormones. Some women with pcos have regular periods most do not.M so if you are not sure i would see a specialist to make sure you have an accurate diagnosis.