Okay well I think that it would be sensible if you started checking the insdie of your bodies at the start of your menstural cycle. This cycle, can cause many ikky things to happen in your body. Includes, cysts, cancer, ect. So I would say, that at the first start of having a menstural cycle, it would be good start to get a check up at least up to every 6 months to a year, just to be on the safe side.